1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
38 #include "tree-iterator.h"
39 #include "tree-inline.h"
47 #include "c-family/c-common.h"
48 #include "c-family/c-objc.h"
49 #include "c-family/c-pragma.h"
50 #include "diagnostic.h"
54 #include "pointer-set.h"
55 #include "splay-tree.h"
58 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_VAR, /* variable */
61 BSP_PARM, /* parameter */
66 static tree grokparms (tree parmlist, tree *);
67 static const char *redeclaration_error_message (tree, tree);
69 static int decl_jump_unsafe (tree);
70 static void require_complete_types_for_parms (tree);
71 static int ambi_op_p (enum tree_code);
72 static int unary_op_p (enum tree_code);
73 static void push_local_name (tree);
74 static tree grok_reference_init (tree, tree, tree, int);
75 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
77 static int check_static_variable_definition (tree, tree);
78 static void record_unknown_type (tree, const char *);
79 static tree builtin_function_1 (tree, tree, bool);
80 static tree build_library_fn_1 (tree, enum tree_code, tree);
81 static int member_function_or_else (tree, tree, enum overload_flags);
82 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
84 static void check_for_uninitialized_const_var (tree);
85 static hashval_t typename_hash (const void *);
86 static int typename_compare (const void *, const void *);
87 static tree local_variable_p_walkfn (tree *, int *, void *);
88 static tree record_builtin_java_type (const char *, int);
89 static const char *tag_name (enum tag_types);
90 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
91 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static tree check_initializer (tree, tree, int, VEC(tree,gc) **);
95 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
96 static void save_function_data (tree);
97 static void copy_type_enum (tree , tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static void record_key_method_defined (tree);
103 static tree create_array_type_for_decl (tree, tree, tree);
104 static tree get_atexit_node (void);
105 static tree get_dso_handle_node (void);
106 static tree start_cleanup_fn (void);
107 static void end_cleanup_fn (void);
108 static tree cp_make_fname_decl (location_t, tree, int);
109 static void initialize_predefined_identifiers (void);
110 static tree check_special_function_return_type
111 (special_function_kind, tree, tree);
112 static tree push_cp_library_fn (enum tree_code, tree);
113 static tree build_cp_library_fn (tree, enum tree_code, tree);
114 static void store_parm_decls (tree);
115 static void initialize_local_var (tree, tree);
116 static void expand_static_init (tree, tree);
118 /* The following symbols are subsumed in the cp_global_trees array, and
119 listed here individually for documentation purposes.
122 tree wchar_decl_node;
124 tree vtable_entry_type;
125 tree delta_type_node;
126 tree __t_desc_type_node;
128 tree class_type_node;
129 tree unknown_type_node;
131 Array type `vtable_entry_type[]'
134 tree vtbl_ptr_type_node;
141 A FUNCTION_DECL which can call `abort'. Not necessarily the
142 one that the user will declare, but sufficient to be called
143 by routines that want to abort the program.
147 The FUNCTION_DECL for the default `::operator delete'.
149 tree global_delete_fndecl;
152 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
153 tree tinfo_var_id; */
155 tree cp_global_trees[CPTI_MAX];
157 /* Indicates that there is a type value in some namespace, although
158 that is not necessarily in scope at the moment. */
160 tree global_type_node;
162 /* The node that holds the "name" of the global scope. */
163 tree global_scope_name;
165 #define local_names cp_function_chain->x_local_names
167 /* A list of objects which have constructors or destructors
168 which reside in the global scope. The decl is stored in
169 the TREE_VALUE slot and the initializer is stored
170 in the TREE_PURPOSE slot. */
171 tree static_aggregates;
175 /* A node for the integer constant 2. */
177 tree integer_two_node;
179 /* Used only for jumps to as-yet undefined labels, since jumps to
180 defined labels can have their validity checked immediately. */
182 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
183 struct named_label_use_entry *next;
184 /* The binding level to which this entry is *currently* attached.
185 This is initially the binding level in which the goto appeared,
186 but is modified as scopes are closed. */
187 cp_binding_level *binding_level;
188 /* The head of the names list that was current when the goto appeared,
189 or the inner scope popped. These are the decls that will *not* be
190 skipped when jumping to the label. */
192 /* The location of the goto, for error reporting. */
193 location_t o_goto_locus;
194 /* True if an OpenMP structured block scope has been closed since
195 the goto appeared. This means that the branch from the label will
196 illegally exit an OpenMP scope. */
200 /* A list of all LABEL_DECLs in the function that have names. Here so
201 we can clear out their names' definitions at the end of the
202 function, and so we can check the validity of jumps to these labels. */
204 struct GTY(()) named_label_entry {
205 /* The decl itself. */
208 /* The binding level to which the label is *currently* attached.
209 This is initially set to the binding level in which the label
210 is defined, but is modified as scopes are closed. */
211 cp_binding_level *binding_level;
212 /* The head of the names list that was current when the label was
213 defined, or the inner scope popped. These are the decls that will
214 be skipped when jumping to the label. */
216 /* A vector of all decls from all binding levels that would be
217 crossed by a backward branch to the label. */
218 VEC(tree,gc) *bad_decls;
220 /* A list of uses of the label, before the label is defined. */
221 struct named_label_use_entry *uses;
223 /* The following bits are set after the label is defined, and are
224 updated as scopes are popped. They indicate that a backward jump
225 to the label will illegally enter a scope of the given flavor. */
231 #define named_labels cp_function_chain->x_named_labels
233 /* The number of function bodies which we are currently processing.
234 (Zero if we are at namespace scope, one inside the body of a
235 function, two inside the body of a function in a local class, etc.) */
238 /* To avoid unwanted recursion, finish_function defers all mark_used calls
239 encountered during its execution until it finishes. */
240 bool defer_mark_used_calls;
241 VEC(tree, gc) *deferred_mark_used_calls;
243 /* States indicating how grokdeclarator() should handle declspecs marked
244 with __attribute__((deprecated)). An object declared as
245 __attribute__((deprecated)) suppresses warnings of uses of other
247 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
250 /* A list of VAR_DECLs whose type was incomplete at the time the
251 variable was declared. */
253 typedef struct GTY(()) incomplete_var_d {
255 tree incomplete_type;
258 DEF_VEC_O(incomplete_var);
259 DEF_VEC_ALLOC_O(incomplete_var,gc);
261 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
263 /* Returns the kind of template specialization we are currently
264 processing, given that it's declaration contained N_CLASS_SCOPES
265 explicit scope qualifications. */
268 current_tmpl_spec_kind (int n_class_scopes)
270 int n_template_parm_scopes = 0;
271 int seen_specialization_p = 0;
272 int innermost_specialization_p = 0;
275 /* Scan through the template parameter scopes. */
276 for (b = current_binding_level;
277 b->kind == sk_template_parms;
280 /* If we see a specialization scope inside a parameter scope,
281 then something is wrong. That corresponds to a declaration
284 template <class T> template <> ...
286 which is always invalid since [temp.expl.spec] forbids the
287 specialization of a class member template if the enclosing
288 class templates are not explicitly specialized as well. */
289 if (b->explicit_spec_p)
291 if (n_template_parm_scopes == 0)
292 innermost_specialization_p = 1;
294 seen_specialization_p = 1;
296 else if (seen_specialization_p == 1)
297 return tsk_invalid_member_spec;
299 ++n_template_parm_scopes;
302 /* Handle explicit instantiations. */
303 if (processing_explicit_instantiation)
305 if (n_template_parm_scopes != 0)
306 /* We've seen a template parameter list during an explicit
307 instantiation. For example:
309 template <class T> template void f(int);
311 This is erroneous. */
312 return tsk_invalid_expl_inst;
314 return tsk_expl_inst;
317 if (n_template_parm_scopes < n_class_scopes)
318 /* We've not seen enough template headers to match all the
319 specialized classes present. For example:
321 template <class T> void R<T>::S<T>::f(int);
323 This is invalid; there needs to be one set of template
324 parameters for each class. */
325 return tsk_insufficient_parms;
326 else if (n_template_parm_scopes == n_class_scopes)
327 /* We're processing a non-template declaration (even though it may
328 be a member of a template class.) For example:
330 template <class T> void S<T>::f(int);
332 The `class T' matches the `S<T>', leaving no template headers
333 corresponding to the `f'. */
335 else if (n_template_parm_scopes > n_class_scopes + 1)
336 /* We've got too many template headers. For example:
338 template <> template <class T> void f (T);
340 There need to be more enclosing classes. */
341 return tsk_excessive_parms;
343 /* This must be a template. It's of the form:
345 template <class T> template <class U> void S<T>::f(U);
347 This is a specialization if the innermost level was a
348 specialization; otherwise it's just a definition of the
350 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
353 /* Exit the current scope. */
361 /* When a label goes out of scope, check to see if that label was used
362 in a valid manner, and issue any appropriate warnings or errors. */
365 pop_label (tree label, tree old_value)
367 if (!processing_template_decl)
369 if (DECL_INITIAL (label) == NULL_TREE)
373 error ("label %q+D used but not defined", label);
374 location = input_location; /* FIXME want (input_filename, (line)0) */
375 /* Avoid crashing later. */
376 define_label (location, DECL_NAME (label));
379 warn_for_unused_label (label);
382 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
385 /* At the end of a function, all labels declared within the function
386 go out of scope. BLOCK is the top-level block for the
390 pop_labels_1 (void **slot, void *data)
392 struct named_label_entry *ent = (struct named_label_entry *) *slot;
393 tree block = (tree) data;
395 pop_label (ent->label_decl, NULL_TREE);
397 /* Put the labels into the "variables" of the top-level block,
398 so debugger can see them. */
399 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
400 BLOCK_VARS (block) = ent->label_decl;
402 htab_clear_slot (named_labels, slot);
408 pop_labels (tree block)
412 htab_traverse (named_labels, pop_labels_1, block);
417 /* At the end of a block with local labels, restore the outer definition. */
420 pop_local_label (tree label, tree old_value)
422 struct named_label_entry dummy;
425 pop_label (label, old_value);
427 dummy.label_decl = label;
428 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
429 htab_clear_slot (named_labels, slot);
432 /* The following two routines are used to interface to Objective-C++.
433 The binding level is purposely treated as an opaque type. */
436 objc_get_current_scope (void)
438 return current_binding_level;
441 /* The following routine is used by the NeXT-style SJLJ exceptions;
442 variables get marked 'volatile' so as to not be clobbered by
443 _setjmp()/_longjmp() calls. All variables in the current scope,
444 as well as parent scopes up to (but not including) ENCLOSING_BLK
445 shall be thusly marked. */
448 objc_mark_locals_volatile (void *enclosing_blk)
450 cp_binding_level *scope;
452 for (scope = current_binding_level;
453 scope && scope != enclosing_blk;
454 scope = scope->level_chain)
458 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
459 objc_volatilize_decl (decl);
461 /* Do not climb up past the current function. */
462 if (scope->kind == sk_function_parms)
467 /* Update data for defined and undefined labels when leaving a scope. */
470 poplevel_named_label_1 (void **slot, void *data)
472 struct named_label_entry *ent = (struct named_label_entry *) *slot;
473 cp_binding_level *bl = (cp_binding_level *) data;
474 cp_binding_level *obl = bl->level_chain;
476 if (ent->binding_level == bl)
480 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
481 TREE_LISTs representing OVERLOADs, so be careful. */
482 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
484 : TREE_CHAIN (decl)))
485 if (decl_jump_unsafe (decl))
486 VEC_safe_push (tree, gc, ent->bad_decls, decl);
488 ent->binding_level = obl;
489 ent->names_in_scope = obl->names;
493 ent->in_try_scope = true;
496 ent->in_catch_scope = true;
499 ent->in_omp_scope = true;
507 struct named_label_use_entry *use;
509 for (use = ent->uses; use ; use = use->next)
510 if (use->binding_level == bl)
512 use->binding_level = obl;
513 use->names_in_scope = obl->names;
514 if (bl->kind == sk_omp)
515 use->in_omp_scope = true;
522 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
523 when errors were reported, except for -Werror-unused-but-set-*. */
524 static int unused_but_set_errorcount;
526 /* Exit a binding level.
527 Pop the level off, and restore the state of the identifier-decl mappings
528 that were in effect when this level was entered.
530 If KEEP == 1, this level had explicit declarations, so
531 and create a "block" (a BLOCK node) for the level
532 to record its declarations and subblocks for symbol table output.
534 If FUNCTIONBODY is nonzero, this level is the body of a function,
535 so create a block as if KEEP were set and also clear out all
538 If REVERSE is nonzero, reverse the order of decls before putting
539 them into the BLOCK. */
542 poplevel (int keep, int reverse, int functionbody)
545 /* The chain of decls was accumulated in reverse order.
546 Put it into forward order, just for cleanliness. */
551 int leaving_for_scope;
554 cp_label_binding *label_bind;
556 timevar_start (TV_NAME_LOOKUP);
561 gcc_assert (current_binding_level->kind != sk_class);
563 if (current_binding_level->kind == sk_cleanup)
565 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
567 gcc_assert (!VEC_length(cp_class_binding,
568 current_binding_level->class_shadowed));
570 /* We used to use KEEP == 2 to indicate that the new block should go
571 at the beginning of the list of blocks at this binding level,
572 rather than the end. This hack is no longer used. */
573 gcc_assert (keep == 0 || keep == 1);
575 if (current_binding_level->keep)
578 /* Any uses of undefined labels, and any defined labels, now operate
579 under constraints of next binding contour. */
580 if (cfun && !functionbody && named_labels)
581 htab_traverse (named_labels, poplevel_named_label_1,
582 current_binding_level);
584 /* Get the decls in the order they were written.
585 Usually current_binding_level->names is in reverse order.
586 But parameter decls were previously put in forward order. */
589 current_binding_level->names
590 = decls = nreverse (current_binding_level->names);
592 decls = current_binding_level->names;
594 /* If there were any declarations or structure tags in that level,
595 or if this level is a function body,
596 create a BLOCK to record them for the life of this function. */
598 if (keep == 1 || functionbody)
599 block = make_node (BLOCK);
600 if (block != NULL_TREE)
602 BLOCK_VARS (block) = decls;
603 BLOCK_SUBBLOCKS (block) = subblocks;
606 /* In each subblock, record that this is its superior. */
608 for (link = subblocks; link; link = BLOCK_CHAIN (link))
609 BLOCK_SUPERCONTEXT (link) = block;
611 /* We still support the old for-scope rules, whereby the variables
612 in a for-init statement were in scope after the for-statement
613 ended. We only use the new rules if flag_new_for_scope is
616 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
618 /* Before we remove the declarations first check for unused variables. */
619 if ((warn_unused_variable || warn_unused_but_set_variable)
620 && !processing_template_decl)
621 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
622 if (TREE_CODE (decl) == VAR_DECL
623 && (! TREE_USED (decl) || !DECL_READ_P (decl))
624 && ! DECL_IN_SYSTEM_HEADER (decl)
625 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
627 if (! TREE_USED (decl))
628 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
629 else if (DECL_CONTEXT (decl) == current_function_decl
630 && TREE_TYPE (decl) != error_mark_node
631 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
632 && errorcount == unused_but_set_errorcount
633 && (!CLASS_TYPE_P (TREE_TYPE (decl))
634 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
636 warning (OPT_Wunused_but_set_variable,
637 "variable %q+D set but not used", decl);
638 unused_but_set_errorcount = errorcount;
642 /* Remove declarations for all the DECLs in this level. */
643 for (link = decls; link; link = TREE_CHAIN (link))
645 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
646 /* It's hard to make this ARM compatibility hack play nicely with
647 lambdas, and it really isn't necessary in C++11 mode. */
648 && cxx_dialect < cxx0x
651 tree name = DECL_NAME (link);
655 ob = outer_binding (name,
656 IDENTIFIER_BINDING (name),
659 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
661 ns_binding = NULL_TREE;
663 if (ob && ob->scope == current_binding_level->level_chain)
664 /* We have something like:
669 and we are leaving the `for' scope. There's no reason to
670 keep the binding of the inner `i' in this case. */
671 pop_binding (name, link);
672 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
673 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
674 /* Here, we have something like:
682 We must pop the for-scope binding so we know what's a
683 type and what isn't. */
684 pop_binding (name, link);
687 /* Mark this VAR_DECL as dead so that we can tell we left it
688 there only for backward compatibility. */
689 DECL_DEAD_FOR_LOCAL (link) = 1;
691 /* Keep track of what should have happened when we
692 popped the binding. */
695 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
696 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
699 /* Add it to the list of dead variables in the next
700 outermost binding to that we can remove these when we
701 leave that binding. */
702 VEC_safe_push (tree, gc,
703 current_binding_level->level_chain->dead_vars_from_for,
706 /* Although we don't pop the cxx_binding, we do clear
707 its SCOPE since the scope is going away now. */
708 IDENTIFIER_BINDING (name)->scope
709 = current_binding_level->level_chain;
716 /* Remove the binding. */
719 if (TREE_CODE (decl) == TREE_LIST)
720 decl = TREE_VALUE (decl);
723 if (TREE_CODE (name) == OVERLOAD)
724 name = OVL_FUNCTION (name);
726 gcc_assert (DECL_P (name));
727 pop_binding (DECL_NAME (name), decl);
731 /* Remove declarations for any `for' variables from inner scopes
732 that we kept around. */
733 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
735 pop_binding (DECL_NAME (decl), decl);
737 /* Restore the IDENTIFIER_TYPE_VALUEs. */
738 for (link = current_binding_level->type_shadowed;
739 link; link = TREE_CHAIN (link))
740 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
742 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
743 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
744 current_binding_level->shadowed_labels,
746 pop_local_label (label_bind->label, label_bind->prev_value);
748 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
749 list if a `using' declaration put them there. The debugging
750 back ends won't understand OVERLOAD, so we remove them here.
751 Because the BLOCK_VARS are (temporarily) shared with
752 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
753 popped all the bindings. */
758 for (d = &BLOCK_VARS (block); *d; )
760 if (TREE_CODE (*d) == TREE_LIST)
761 *d = TREE_CHAIN (*d);
763 d = &DECL_CHAIN (*d);
767 /* If the level being exited is the top level of a function,
768 check over all the labels. */
771 /* Since this is the top level block of a function, the vars are
772 the function's parameters. Don't leave them in the BLOCK
773 because they are found in the FUNCTION_DECL instead. */
774 BLOCK_VARS (block) = 0;
778 kind = current_binding_level->kind;
779 if (kind == sk_cleanup)
783 /* If this is a temporary binding created for a cleanup, then we'll
784 have pushed a statement list level. Pop that, create a new
785 BIND_EXPR for the block, and insert it into the stream. */
786 stmt = pop_stmt_list (current_binding_level->statement_list);
787 stmt = c_build_bind_expr (input_location, block, stmt);
794 /* The current function is being defined, so its DECL_INITIAL
795 should be error_mark_node. */
796 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
797 DECL_INITIAL (current_function_decl) = block;
800 current_binding_level->blocks
801 = block_chainon (current_binding_level->blocks, block);
803 /* If we did not make a block for the level just exited,
804 any blocks made for inner levels
805 (since they cannot be recorded as subblocks in that level)
806 must be carried forward so they will later become subblocks
807 of something else. */
809 current_binding_level->blocks
810 = block_chainon (current_binding_level->blocks, subblocks);
812 /* Each and every BLOCK node created here in `poplevel' is important
813 (e.g. for proper debugging information) so if we created one
814 earlier, mark it as "used". */
816 TREE_USED (block) = 1;
818 /* All temporary bindings created for cleanups are popped silently. */
819 if (kind == sk_cleanup)
822 timevar_stop (TV_NAME_LOOKUP);
826 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
827 itself, calling F for each. The DATA is passed to F as well. */
830 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
833 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
835 result |= (*f) (name_space, data);
837 for (; current; current = DECL_CHAIN (current))
838 result |= walk_namespaces_r (current, f, data);
843 /* Walk all the namespaces, calling F for each. The DATA is passed to
847 walk_namespaces (walk_namespaces_fn f, void* data)
849 return walk_namespaces_r (global_namespace, f, data);
852 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
853 DATA is non-NULL, this is the last time we will call
854 wrapup_global_declarations for this NAMESPACE. */
857 wrapup_globals_for_namespace (tree name_space, void* data)
859 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
860 VEC(tree,gc) *statics = level->static_decls;
861 tree *vec = VEC_address (tree, statics);
862 int len = VEC_length (tree, statics);
863 int last_time = (data != 0);
867 check_global_declarations (vec, len);
868 emit_debug_global_declarations (vec, len);
872 /* Write out any globals that need to be output. */
873 return wrapup_global_declarations (vec, len);
877 /* In C++, you don't have to write `struct S' to refer to `S'; you
878 can just use `S'. We accomplish this by creating a TYPE_DECL as
879 if the user had written `typedef struct S S'. Create and return
880 the TYPE_DECL for TYPE. */
883 create_implicit_typedef (tree name, tree type)
887 decl = build_decl (input_location, TYPE_DECL, name, type);
888 DECL_ARTIFICIAL (decl) = 1;
889 /* There are other implicit type declarations, like the one *within*
890 a class that allows you to write `S::S'. We must distinguish
892 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
893 TYPE_NAME (type) = decl;
894 TYPE_STUB_DECL (type) = decl;
899 /* Remember a local name for name-mangling purposes. */
902 push_local_name (tree decl)
907 timevar_start (TV_NAME_LOOKUP);
909 name = DECL_NAME (decl);
911 nelts = VEC_length (tree, local_names);
912 for (i = 0; i < nelts; i++)
914 t = VEC_index (tree, local_names, i);
915 if (DECL_NAME (t) == name)
917 if (!DECL_LANG_SPECIFIC (decl))
918 retrofit_lang_decl (decl);
919 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
920 if (DECL_LANG_SPECIFIC (t))
921 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
923 DECL_DISCRIMINATOR (decl) = 1;
925 VEC_replace (tree, local_names, i, decl);
926 timevar_stop (TV_NAME_LOOKUP);
931 VEC_safe_push (tree, gc, local_names, decl);
932 timevar_stop (TV_NAME_LOOKUP);
935 /* Subroutine of duplicate_decls: return truthvalue of whether
936 or not types of these decls match.
938 For C++, we must compare the parameter list so that `int' can match
939 `int&' in a parameter position, but `int&' is not confused with
943 decls_match (tree newdecl, tree olddecl)
947 if (newdecl == olddecl)
950 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
951 /* If the two DECLs are not even the same kind of thing, we're not
952 interested in their types. */
955 if (TREE_CODE (newdecl) == FUNCTION_DECL)
957 tree f1 = TREE_TYPE (newdecl);
958 tree f2 = TREE_TYPE (olddecl);
959 tree p1 = TYPE_ARG_TYPES (f1);
960 tree p2 = TYPE_ARG_TYPES (f2);
962 /* Specializations of different templates are different functions
963 even if they have the same type. */
964 tree t1 = (DECL_USE_TEMPLATE (newdecl)
965 ? DECL_TI_TEMPLATE (newdecl)
967 tree t2 = (DECL_USE_TEMPLATE (olddecl)
968 ? DECL_TI_TEMPLATE (olddecl)
973 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
974 && ! (DECL_EXTERN_C_P (newdecl)
975 && DECL_EXTERN_C_P (olddecl)))
978 #ifdef NO_IMPLICIT_EXTERN_C
979 /* A new declaration doesn't match a built-in one unless it
980 is also extern "C". */
981 if (DECL_IS_BUILTIN (olddecl)
982 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
986 if (TREE_CODE (f1) != TREE_CODE (f2))
989 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
991 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
992 && (DECL_BUILT_IN (olddecl)
993 #ifndef NO_IMPLICIT_EXTERN_C
994 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
995 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
999 types_match = self_promoting_args_p (p1);
1000 if (p1 == void_list_node)
1001 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1003 #ifndef NO_IMPLICIT_EXTERN_C
1004 else if (!prototype_p (f1)
1005 && (DECL_EXTERN_C_P (olddecl)
1006 && DECL_IN_SYSTEM_HEADER (olddecl)
1007 && !DECL_CLASS_SCOPE_P (olddecl))
1008 && (DECL_EXTERN_C_P (newdecl)
1009 && DECL_IN_SYSTEM_HEADER (newdecl)
1010 && !DECL_CLASS_SCOPE_P (newdecl)))
1012 types_match = self_promoting_args_p (p2);
1013 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1019 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1020 || comp_type_attributes (TREE_TYPE (newdecl),
1021 TREE_TYPE (olddecl)) != 0);
1026 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1028 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1029 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1032 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1033 DECL_TEMPLATE_PARMS (olddecl)))
1036 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1037 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1038 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1040 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1041 DECL_TEMPLATE_RESULT (newdecl));
1045 /* Need to check scope for variable declaration (VAR_DECL).
1046 For typedef (TYPE_DECL), scope is ignored. */
1047 if (TREE_CODE (newdecl) == VAR_DECL
1048 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1050 Two declarations for an object with C language linkage
1051 with the same name (ignoring the namespace that qualify
1052 it) that appear in different namespace scopes refer to
1054 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1057 if (TREE_TYPE (newdecl) == error_mark_node)
1058 types_match = TREE_TYPE (olddecl) == error_mark_node;
1059 else if (TREE_TYPE (olddecl) == NULL_TREE)
1060 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1061 else if (TREE_TYPE (newdecl) == NULL_TREE)
1064 types_match = comptypes (TREE_TYPE (newdecl),
1065 TREE_TYPE (olddecl),
1066 COMPARE_REDECLARATION);
1072 /* If NEWDECL is `static' and an `extern' was seen previously,
1073 warn about it. OLDDECL is the previous declaration.
1075 Note that this does not apply to the C++ case of declaring
1076 a variable `extern const' and then later `const'.
1078 Don't complain about built-in functions, since they are beyond
1079 the user's control. */
1082 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1084 if (TREE_CODE (newdecl) == TYPE_DECL
1085 || TREE_CODE (newdecl) == TEMPLATE_DECL
1086 || TREE_CODE (newdecl) == CONST_DECL
1087 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1090 /* Don't get confused by static member functions; that's a different
1092 if (TREE_CODE (newdecl) == FUNCTION_DECL
1093 && DECL_STATIC_FUNCTION_P (newdecl))
1096 /* If the old declaration was `static', or the new one isn't, then
1097 everything is OK. */
1098 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1101 /* It's OK to declare a builtin function as `static'. */
1102 if (TREE_CODE (olddecl) == FUNCTION_DECL
1103 && DECL_ARTIFICIAL (olddecl))
1106 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1107 permerror (input_location, "previous declaration of %q+D", olddecl);
1110 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1111 function templates. If their exception specifications do not
1112 match, issue a diagnostic. */
1115 check_redeclaration_exception_specification (tree new_decl,
1120 tree new_exceptions;
1121 tree old_exceptions;
1123 new_type = TREE_TYPE (new_decl);
1124 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1125 old_type = TREE_TYPE (old_decl);
1126 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1130 If any declaration of a function has an exception-specification,
1131 all declarations, including the definition and an explicit
1132 specialization, of that function shall have an
1133 exception-specification with the same set of type-ids. */
1134 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1135 && ! DECL_IS_BUILTIN (old_decl)
1137 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1139 error ("declaration of %qF has a different exception specifier",
1141 error ("from previous declaration %q+F", old_decl);
1145 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1146 Otherwise issue diagnostics. */
1149 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1151 old_decl = STRIP_TEMPLATE (old_decl);
1152 new_decl = STRIP_TEMPLATE (new_decl);
1153 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1154 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1156 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1157 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1159 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1161 /* Hide a built-in declaration. */
1162 DECL_DECLARED_CONSTEXPR_P (old_decl)
1163 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1166 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1167 error ("from previous declaration %q+D", old_decl);
1171 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1172 && lookup_attribute ("gnu_inline", \
1173 DECL_ATTRIBUTES (fn)))
1175 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1176 If the redeclaration is invalid, a diagnostic is issued, and the
1177 error_mark_node is returned. Otherwise, OLDDECL is returned.
1179 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1182 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1185 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1187 unsigned olddecl_uid = DECL_UID (olddecl);
1188 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1189 int new_defines_function = 0;
1190 tree new_template_info;
1192 if (newdecl == olddecl)
1195 types_match = decls_match (newdecl, olddecl);
1197 /* If either the type of the new decl or the type of the old decl is an
1198 error_mark_node, then that implies that we have already issued an
1199 error (earlier) for some bogus type specification, and in that case,
1200 it is rather pointless to harass the user with yet more error message
1201 about the same declaration, so just pretend the types match here. */
1202 if (TREE_TYPE (newdecl) == error_mark_node
1203 || TREE_TYPE (olddecl) == error_mark_node)
1204 return error_mark_node;
1206 if (UDLIT_OPER_P (DECL_NAME (newdecl))
1207 && UDLIT_OPER_P (DECL_NAME (olddecl)))
1209 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1210 && TREE_CODE (olddecl) != TEMPLATE_DECL
1211 && check_raw_literal_operator (olddecl))
1212 error ("literal operator template %q+D conflicts with"
1213 " raw literal operator %qD", newdecl, olddecl);
1214 else if (TREE_CODE (newdecl) != TEMPLATE_DECL
1215 && TREE_CODE (olddecl) == TEMPLATE_DECL
1216 && check_raw_literal_operator (newdecl))
1217 error ("raw literal operator %q+D conflicts with"
1218 " literal operator template %qD", newdecl, olddecl);
1221 if (DECL_P (olddecl)
1222 && TREE_CODE (newdecl) == FUNCTION_DECL
1223 && TREE_CODE (olddecl) == FUNCTION_DECL
1224 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1226 if (DECL_DECLARED_INLINE_P (newdecl)
1227 && DECL_UNINLINABLE (newdecl)
1228 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1229 /* Already warned elsewhere. */;
1230 else if (DECL_DECLARED_INLINE_P (olddecl)
1231 && DECL_UNINLINABLE (olddecl)
1232 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1233 /* Already warned. */;
1234 else if (DECL_DECLARED_INLINE_P (newdecl)
1235 && DECL_UNINLINABLE (olddecl)
1236 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1238 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1240 warning (OPT_Wattributes, "previous declaration of %q+D "
1241 "with attribute noinline", olddecl);
1243 else if (DECL_DECLARED_INLINE_P (olddecl)
1244 && DECL_UNINLINABLE (newdecl)
1245 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1247 warning (OPT_Wattributes, "function %q+D redeclared with "
1248 "attribute noinline", newdecl);
1249 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1254 /* Check for redeclaration and other discrepancies. */
1255 if (TREE_CODE (olddecl) == FUNCTION_DECL
1256 && DECL_ARTIFICIAL (olddecl))
1258 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1259 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1261 /* Avoid warnings redeclaring built-ins which have not been
1262 explicitly declared. */
1263 if (DECL_ANTICIPATED (olddecl))
1266 /* If you declare a built-in or predefined function name as static,
1267 the old definition is overridden, but optionally warn this was a
1268 bad choice of name. */
1269 if (! TREE_PUBLIC (newdecl))
1271 warning (OPT_Wshadow,
1272 DECL_BUILT_IN (olddecl)
1273 ? G_("shadowing built-in function %q#D")
1274 : G_("shadowing library function %q#D"), olddecl);
1275 /* Discard the old built-in function. */
1278 /* If the built-in is not ansi, then programs can override
1279 it even globally without an error. */
1280 else if (! DECL_BUILT_IN (olddecl))
1281 warning (0, "library function %q#D redeclared as non-function %q#D",
1285 error ("declaration of %q#D", newdecl);
1286 error ("conflicts with built-in declaration %q#D",
1291 else if (!types_match)
1293 /* Avoid warnings redeclaring built-ins which have not been
1294 explicitly declared. */
1295 if (DECL_ANTICIPATED (olddecl))
1297 /* Deal with fileptr_type_node. FILE type is not known
1298 at the time we create the builtins. */
1301 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1302 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1304 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1307 else if (TREE_VALUE (t2) == fileptr_type_node)
1309 tree t = TREE_VALUE (t1);
1311 if (TREE_CODE (t) == POINTER_TYPE
1312 && TYPE_NAME (TREE_TYPE (t))
1313 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1314 == get_identifier ("FILE")
1315 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1317 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1319 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1320 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1321 types_match = decls_match (newdecl, olddecl);
1323 return duplicate_decls (newdecl, olddecl,
1325 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1328 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1331 else if ((DECL_EXTERN_C_P (newdecl)
1332 && DECL_EXTERN_C_P (olddecl))
1333 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1334 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1336 /* A near match; override the builtin. */
1338 if (TREE_PUBLIC (newdecl))
1340 warning (0, "new declaration %q#D", newdecl);
1341 warning (0, "ambiguates built-in declaration %q#D",
1345 warning (OPT_Wshadow,
1346 DECL_BUILT_IN (olddecl)
1347 ? G_("shadowing built-in function %q#D")
1348 : G_("shadowing library function %q#D"), olddecl);
1351 /* Discard the old built-in function. */
1354 /* Replace the old RTL to avoid problems with inlining. */
1355 COPY_DECL_RTL (newdecl, olddecl);
1357 /* Even if the types match, prefer the new declarations type for
1358 built-ins which have not been explicitly declared, for
1359 exception lists, etc... */
1360 else if (DECL_IS_BUILTIN (olddecl))
1362 tree type = TREE_TYPE (newdecl);
1363 tree attribs = (*targetm.merge_type_attributes)
1364 (TREE_TYPE (olddecl), type);
1366 type = cp_build_type_attribute_variant (type, attribs);
1367 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1370 /* If a function is explicitly declared "throw ()", propagate that to
1371 the corresponding builtin. */
1372 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1373 && DECL_ANTICIPATED (olddecl)
1374 && TREE_NOTHROW (newdecl)
1375 && !TREE_NOTHROW (olddecl))
1377 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1378 tree tmpdecl = builtin_decl_explicit (fncode);
1379 if (tmpdecl && tmpdecl != olddecl && types_match)
1380 TREE_NOTHROW (tmpdecl) = 1;
1383 /* Whether or not the builtin can throw exceptions has no
1384 bearing on this declarator. */
1385 TREE_NOTHROW (olddecl) = 0;
1387 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1389 /* If a builtin function is redeclared as `static', merge
1390 the declarations, but make the original one static. */
1391 DECL_THIS_STATIC (olddecl) = 1;
1392 TREE_PUBLIC (olddecl) = 0;
1394 /* Make the old declaration consistent with the new one so
1395 that all remnants of the builtin-ness of this function
1396 will be banished. */
1397 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1398 COPY_DECL_RTL (newdecl, olddecl);
1401 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1403 /* C++ Standard, 3.3, clause 4:
1404 "[Note: a namespace name or a class template name must be unique
1405 in its declarative region (7.3.2, clause 14). ]" */
1406 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1407 && TREE_CODE (newdecl) != NAMESPACE_DECL
1408 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1409 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1410 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1411 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1413 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1414 && TREE_CODE (newdecl) != TYPE_DECL)
1415 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1416 && TREE_CODE (olddecl) != TYPE_DECL))
1418 /* We do nothing special here, because C++ does such nasty
1419 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1420 get shadowed, and know that if we need to find a TYPE_DECL
1421 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1422 slot of the identifier. */
1426 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1427 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1428 || (TREE_CODE (olddecl) == FUNCTION_DECL
1429 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1433 error ("%q#D redeclared as different kind of symbol", newdecl);
1434 if (TREE_CODE (olddecl) == TREE_LIST)
1435 olddecl = TREE_VALUE (olddecl);
1436 error ("previous declaration of %q+#D", olddecl);
1438 return error_mark_node;
1440 else if (!types_match)
1442 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1443 /* These are certainly not duplicate declarations; they're
1444 from different scopes. */
1447 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1449 /* The name of a class template may not be declared to refer to
1450 any other template, class, function, object, namespace, value,
1451 or type in the same scope. */
1452 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1453 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1455 error ("declaration of template %q#D", newdecl);
1456 error ("conflicts with previous declaration %q+#D", olddecl);
1458 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1459 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1460 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1461 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1462 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1463 DECL_TEMPLATE_PARMS (olddecl))
1464 /* Template functions can be disambiguated by
1466 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1467 TREE_TYPE (TREE_TYPE (olddecl))))
1469 error ("new declaration %q#D", newdecl);
1470 error ("ambiguates old declaration %q+#D", olddecl);
1474 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1476 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1478 error ("declaration of C function %q#D conflicts with",
1480 error ("previous declaration %q+#D here", olddecl);
1483 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1484 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1486 error ("new declaration %q#D", newdecl);
1487 error ("ambiguates old declaration %q+#D", olddecl);
1488 return error_mark_node;
1495 error ("conflicting declaration %q#D", newdecl);
1496 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1497 return error_mark_node;
1500 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1501 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1502 && (!DECL_TEMPLATE_INFO (newdecl)
1503 || (DECL_TI_TEMPLATE (newdecl)
1504 != DECL_TI_TEMPLATE (olddecl))))
1505 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1506 && (!DECL_TEMPLATE_INFO (olddecl)
1507 || (DECL_TI_TEMPLATE (olddecl)
1508 != DECL_TI_TEMPLATE (newdecl))))))
1509 /* It's OK to have a template specialization and a non-template
1510 with the same type, or to have specializations of two
1511 different templates with the same type. Note that if one is a
1512 specialization, and the other is an instantiation of the same
1513 template, that we do not exit at this point. That situation
1514 can occur if we instantiate a template class, and then
1515 specialize one of its methods. This situation is valid, but
1516 the declarations must be merged in the usual way. */
1518 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1519 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1520 && !DECL_USE_TEMPLATE (newdecl))
1521 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1522 && !DECL_USE_TEMPLATE (olddecl))))
1523 /* One of the declarations is a template instantiation, and the
1524 other is not a template at all. That's OK. */
1526 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1528 /* In [namespace.alias] we have:
1530 In a declarative region, a namespace-alias-definition can be
1531 used to redefine a namespace-alias declared in that declarative
1532 region to refer only to the namespace to which it already
1535 Therefore, if we encounter a second alias directive for the same
1536 alias, we can just ignore the second directive. */
1537 if (DECL_NAMESPACE_ALIAS (newdecl)
1538 && (DECL_NAMESPACE_ALIAS (newdecl)
1539 == DECL_NAMESPACE_ALIAS (olddecl)))
1541 /* [namespace.alias]
1543 A namespace-name or namespace-alias shall not be declared as
1544 the name of any other entity in the same declarative region.
1545 A namespace-name defined at global scope shall not be
1546 declared as the name of any other entity in any global scope
1548 error ("declaration of namespace %qD conflicts with", newdecl);
1549 error ("previous declaration of namespace %q+D here", olddecl);
1550 return error_mark_node;
1554 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1557 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1558 if (DECL_NAME (olddecl) != NULL_TREE)
1559 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1560 ? G_("%q+#D previously defined here")
1561 : G_("%q+#D previously declared here"), olddecl);
1562 return error_mark_node;
1564 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1565 && DECL_INITIAL (olddecl) != NULL_TREE
1566 && !prototype_p (TREE_TYPE (olddecl))
1567 && prototype_p (TREE_TYPE (newdecl)))
1569 /* Prototype decl follows defn w/o prototype. */
1570 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1571 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1572 "follows non-prototype definition here");
1574 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1575 || TREE_CODE (olddecl) == VAR_DECL)
1576 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1579 If two declarations of the same function or object
1580 specify different linkage-specifications ..., the program
1581 is ill-formed.... Except for functions with C++ linkage,
1582 a function declaration without a linkage specification
1583 shall not precede the first linkage specification for
1584 that function. A function can be declared without a
1585 linkage specification after an explicit linkage
1586 specification has been seen; the linkage explicitly
1587 specified in the earlier declaration is not affected by
1588 such a function declaration.
1590 DR 563 raises the question why the restrictions on
1591 functions should not also apply to objects. Older
1592 versions of G++ silently ignore the linkage-specification
1600 which is clearly wrong. Therefore, we now treat objects
1602 if (current_lang_depth () == 0)
1604 /* There is no explicit linkage-specification, so we use
1605 the linkage from the previous declaration. */
1606 if (!DECL_LANG_SPECIFIC (newdecl))
1607 retrofit_lang_decl (newdecl);
1608 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1612 error ("previous declaration of %q+#D with %qL linkage",
1613 olddecl, DECL_LANGUAGE (olddecl));
1614 error ("conflicts with new declaration with %qL linkage",
1615 DECL_LANGUAGE (newdecl));
1619 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1621 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1623 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1624 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1627 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1628 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1630 for (; t1 && t1 != void_list_node;
1631 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1632 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1634 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1637 permerror (input_location, "default argument given for parameter %d of %q#D",
1639 permerror (input_location, "after previous specification in %q+#D", olddecl);
1643 error ("default argument given for parameter %d of %q#D",
1645 error ("after previous specification in %q+#D",
1652 /* Do not merge an implicit typedef with an explicit one. In:
1656 typedef class A A __attribute__ ((foo));
1658 the attribute should apply only to the typedef. */
1659 if (TREE_CODE (olddecl) == TYPE_DECL
1660 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1661 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1664 /* If new decl is `static' and an `extern' was seen previously,
1666 warn_extern_redeclared_static (newdecl, olddecl);
1668 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1669 return error_mark_node;
1671 /* We have committed to returning 1 at this point. */
1672 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1674 /* Now that functions must hold information normally held
1675 by field decls, there is extra work to do so that
1676 declaration information does not get destroyed during
1678 if (DECL_VINDEX (olddecl))
1679 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1680 if (DECL_CONTEXT (olddecl))
1681 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1682 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1683 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1684 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1685 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1686 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1687 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1688 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1689 SET_OVERLOADED_OPERATOR_CODE
1690 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1691 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1693 /* Optionally warn about more than one declaration for the same
1694 name, but don't warn about a function declaration followed by a
1696 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1697 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1698 /* Don't warn about extern decl followed by definition. */
1699 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1700 /* Don't warn about friends, let add_friend take care of it. */
1701 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1703 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1704 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1707 if (DECL_DELETED_FN (newdecl))
1709 error ("deleted definition of %qD", newdecl);
1710 error ("after previous declaration %q+D", olddecl);
1712 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1715 /* Deal with C++: must preserve virtual function table size. */
1716 if (TREE_CODE (olddecl) == TYPE_DECL)
1718 tree newtype = TREE_TYPE (newdecl);
1719 tree oldtype = TREE_TYPE (olddecl);
1721 if (newtype != error_mark_node && oldtype != error_mark_node
1722 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1723 CLASSTYPE_FRIEND_CLASSES (newtype)
1724 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1726 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1729 /* Copy all the DECL_... slots specified in the new decl
1730 except for any that we copy here from the old type. */
1731 DECL_ATTRIBUTES (newdecl)
1732 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1734 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1738 old_result = DECL_TEMPLATE_RESULT (olddecl);
1739 new_result = DECL_TEMPLATE_RESULT (newdecl);
1740 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1741 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1742 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1743 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1745 DECL_ATTRIBUTES (old_result)
1746 = (*targetm.merge_decl_attributes) (old_result, new_result);
1748 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1750 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1751 && DECL_INITIAL (new_result))
1753 if (DECL_INITIAL (old_result))
1754 DECL_UNINLINABLE (old_result) = 1;
1756 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1757 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1758 DECL_NOT_REALLY_EXTERN (old_result)
1759 = DECL_NOT_REALLY_EXTERN (new_result);
1760 DECL_INTERFACE_KNOWN (old_result)
1761 = DECL_INTERFACE_KNOWN (new_result);
1762 DECL_DECLARED_INLINE_P (old_result)
1763 = DECL_DECLARED_INLINE_P (new_result);
1764 DECL_DISREGARD_INLINE_LIMITS (old_result)
1765 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1770 DECL_DECLARED_INLINE_P (old_result)
1771 |= DECL_DECLARED_INLINE_P (new_result);
1772 DECL_DISREGARD_INLINE_LIMITS (old_result)
1773 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1774 check_redeclaration_exception_specification (newdecl, olddecl);
1778 /* If the new declaration is a definition, update the file and
1779 line information on the declaration, and also make
1780 the old declaration the same definition. */
1781 if (DECL_INITIAL (new_result) != NULL_TREE)
1783 DECL_SOURCE_LOCATION (olddecl)
1784 = DECL_SOURCE_LOCATION (old_result)
1785 = DECL_SOURCE_LOCATION (newdecl);
1786 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1787 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1790 DECL_ARGUMENTS (old_result)
1791 = DECL_ARGUMENTS (new_result);
1792 for (parm = DECL_ARGUMENTS (old_result); parm;
1793 parm = DECL_CHAIN (parm))
1794 DECL_CONTEXT (parm) = old_result;
1803 /* Automatically handles default parameters. */
1804 tree oldtype = TREE_TYPE (olddecl);
1807 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1808 maybe_instantiate_noexcept (olddecl);
1810 /* Merge the data types specified in the two decls. */
1811 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1813 /* If merge_types produces a non-typedef type, just use the old type. */
1814 if (TREE_CODE (newdecl) == TYPE_DECL
1815 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1818 if (TREE_CODE (newdecl) == VAR_DECL)
1820 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1821 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1822 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1823 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1824 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1825 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1827 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1828 if (DECL_LANG_SPECIFIC (olddecl)
1829 && CP_DECL_THREADPRIVATE_P (olddecl))
1831 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1832 if (!DECL_LANG_SPECIFIC (newdecl))
1833 retrofit_lang_decl (newdecl);
1835 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1836 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1840 /* Do this after calling `merge_types' so that default
1841 parameters don't confuse us. */
1842 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1843 check_redeclaration_exception_specification (newdecl, olddecl);
1844 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1846 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1847 check_default_args (newdecl);
1849 /* Lay the type out, unless already done. */
1850 if (! same_type_p (newtype, oldtype)
1851 && TREE_TYPE (newdecl) != error_mark_node
1852 && !(processing_template_decl && uses_template_parms (newdecl)))
1853 layout_type (TREE_TYPE (newdecl));
1855 if ((TREE_CODE (newdecl) == VAR_DECL
1856 || TREE_CODE (newdecl) == PARM_DECL
1857 || TREE_CODE (newdecl) == RESULT_DECL
1858 || TREE_CODE (newdecl) == FIELD_DECL
1859 || TREE_CODE (newdecl) == TYPE_DECL)
1860 && !(processing_template_decl && uses_template_parms (newdecl)))
1861 layout_decl (newdecl, 0);
1863 /* Merge the type qualifiers. */
1864 if (TREE_READONLY (newdecl))
1865 TREE_READONLY (olddecl) = 1;
1866 if (TREE_THIS_VOLATILE (newdecl))
1867 TREE_THIS_VOLATILE (olddecl) = 1;
1868 if (TREE_NOTHROW (newdecl))
1869 TREE_NOTHROW (olddecl) = 1;
1871 /* Merge deprecatedness. */
1872 if (TREE_DEPRECATED (newdecl))
1873 TREE_DEPRECATED (olddecl) = 1;
1875 /* Preserve function specific target and optimization options */
1876 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1878 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1879 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1880 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1881 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1883 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1884 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1885 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1886 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1889 /* Merge the initialization information. */
1890 if (DECL_INITIAL (newdecl) == NULL_TREE
1891 && DECL_INITIAL (olddecl) != NULL_TREE)
1893 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1894 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1895 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1897 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1898 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1902 /* Merge the section attribute.
1903 We want to issue an error if the sections conflict but that must be
1904 done later in decl_attributes since we are called before attributes
1906 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1907 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1909 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1911 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1912 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1913 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1914 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1915 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1916 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1917 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1918 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1919 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1920 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1921 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1922 /* Keep the old RTL. */
1923 COPY_DECL_RTL (olddecl, newdecl);
1925 else if (TREE_CODE (newdecl) == VAR_DECL
1926 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1928 /* Keep the old RTL. We cannot keep the old RTL if the old
1929 declaration was for an incomplete object and the new
1930 declaration is not since many attributes of the RTL will
1932 COPY_DECL_RTL (olddecl, newdecl);
1935 /* If cannot merge, then use the new type and qualifiers,
1936 and don't preserve the old rtl. */
1939 /* Clean out any memory we had of the old declaration. */
1940 tree oldstatic = value_member (olddecl, static_aggregates);
1942 TREE_VALUE (oldstatic) = error_mark_node;
1944 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1945 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1946 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1947 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1950 /* Merge the storage class information. */
1951 merge_weak (newdecl, olddecl);
1953 if (DECL_ONE_ONLY (olddecl))
1954 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1956 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1957 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1958 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1959 if (! DECL_EXTERNAL (olddecl))
1960 DECL_EXTERNAL (newdecl) = 0;
1962 new_template_info = NULL_TREE;
1963 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1965 bool new_redefines_gnu_inline = false;
1967 if (new_defines_function
1968 && ((DECL_INTERFACE_KNOWN (olddecl)
1969 && TREE_CODE (olddecl) == FUNCTION_DECL)
1970 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1971 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1972 == FUNCTION_DECL))))
1976 if (TREE_CODE (fn) == TEMPLATE_DECL)
1977 fn = DECL_TEMPLATE_RESULT (olddecl);
1979 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1982 if (!new_redefines_gnu_inline)
1984 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1985 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1986 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1988 DECL_TEMPLATE_INSTANTIATED (newdecl)
1989 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1990 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1992 /* If the OLDDECL is an instantiation and/or specialization,
1993 then the NEWDECL must be too. But, it may not yet be marked
1994 as such if the caller has created NEWDECL, but has not yet
1995 figured out that it is a redeclaration. */
1996 if (!DECL_USE_TEMPLATE (newdecl))
1997 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1999 /* Don't really know how much of the language-specific
2000 values we should copy from old to new. */
2001 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2002 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
2003 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2004 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2006 if (LANG_DECL_HAS_MIN (newdecl))
2008 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
2009 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
2010 if (DECL_TEMPLATE_INFO (newdecl))
2011 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2012 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2014 /* Only functions have these fields. */
2015 if (TREE_CODE (newdecl) == FUNCTION_DECL
2016 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2018 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2019 olddecl_friend = DECL_FRIEND_P (olddecl);
2020 hidden_friend = (DECL_ANTICIPATED (olddecl)
2021 && DECL_HIDDEN_FRIEND_P (olddecl)
2022 && newdecl_is_friend);
2023 DECL_BEFRIENDING_CLASSES (newdecl)
2024 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2025 DECL_BEFRIENDING_CLASSES (olddecl));
2026 /* DECL_THUNKS is only valid for virtual functions,
2027 otherwise it is a DECL_FRIEND_CONTEXT. */
2028 if (DECL_VIRTUAL_P (newdecl))
2029 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2031 /* Only variables have this field. */
2032 else if (TREE_CODE (newdecl) == VAR_DECL
2033 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2034 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2037 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2041 /* Merge parameter attributes. */
2042 tree oldarg, newarg;
2043 for (oldarg = DECL_ARGUMENTS(olddecl),
2044 newarg = DECL_ARGUMENTS(newdecl);
2046 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2047 DECL_ATTRIBUTES (newarg)
2048 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2049 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2052 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2053 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2055 /* If newdecl is not a specialization, then it is not a
2056 template-related function at all. And that means that we
2057 should have exited above, returning 0. */
2058 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2060 if (DECL_ODR_USED (olddecl))
2061 /* From [temp.expl.spec]:
2063 If a template, a member template or the member of a class
2064 template is explicitly specialized then that
2065 specialization shall be declared before the first use of
2066 that specialization that would cause an implicit
2067 instantiation to take place, in every translation unit in
2068 which such a use occurs. */
2069 error ("explicit specialization of %qD after first use",
2072 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2074 /* Don't propagate visibility from the template to the
2075 specialization here. We'll do that in determine_visibility if
2077 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2079 /* [temp.expl.spec/14] We don't inline explicit specialization
2080 just because the primary template says so. */
2082 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2083 the always_inline attribute. */
2084 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2085 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2087 if (DECL_DECLARED_INLINE_P (newdecl))
2088 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2090 DECL_ATTRIBUTES (newdecl)
2091 = remove_attribute ("always_inline",
2092 DECL_ATTRIBUTES (newdecl));
2095 else if (new_defines_function && DECL_INITIAL (olddecl))
2097 /* Never inline re-defined extern inline functions.
2098 FIXME: this could be better handled by keeping both
2099 function as separate declarations. */
2100 DECL_UNINLINABLE (newdecl) = 1;
2104 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2105 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2107 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2109 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2110 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2112 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2113 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2114 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2115 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2118 /* Preserve abstractness on cloned [cd]tors. */
2119 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2121 /* Update newdecl's parms to point at olddecl. */
2122 for (parm = DECL_ARGUMENTS (newdecl); parm;
2123 parm = DECL_CHAIN (parm))
2124 DECL_CONTEXT (parm) = olddecl;
2128 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2129 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2130 COPY_DECL_RTL (newdecl, olddecl);
2132 if (! types_match || new_defines_function)
2134 /* These need to be copied so that the names are available.
2135 Note that if the types do match, we'll preserve inline
2136 info and other bits, but if not, we won't. */
2137 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2138 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2140 if (new_defines_function)
2141 /* If defining a function declared with other language
2142 linkage, use the previously declared language linkage. */
2143 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2144 else if (types_match)
2146 /* If redeclaring a builtin function, and not a definition,
2147 it stays built in. */
2148 if (DECL_BUILT_IN (olddecl))
2150 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2151 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2152 /* If we're keeping the built-in definition, keep the rtl,
2153 regardless of declaration matches. */
2154 COPY_DECL_RTL (olddecl, newdecl);
2155 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2157 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2160 /* If a compatible prototype of these builtin functions
2161 is seen, assume the runtime implements it with the
2162 expected semantics. */
2163 case BUILT_IN_STPCPY:
2164 if (builtin_decl_explicit_p (fncode))
2165 set_builtin_decl_implicit_p (fncode, true);
2173 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2174 /* Don't clear out the arguments if we're just redeclaring a
2176 if (DECL_ARGUMENTS (olddecl))
2177 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2180 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2181 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2183 /* Now preserve various other info from the definition. */
2184 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2185 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2186 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2187 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2189 /* Warn about conflicting visibility specifications. */
2190 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2191 && DECL_VISIBILITY_SPECIFIED (newdecl)
2192 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2194 warning_at (input_location, OPT_Wattributes,
2195 "%q+D: visibility attribute ignored because it", newdecl);
2196 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2197 "conflicts with previous declaration here");
2199 /* Choose the declaration which specified visibility. */
2200 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2202 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2203 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2205 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2206 so keep this behavior. */
2207 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2209 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2210 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2212 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2213 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2214 if (TREE_CODE (newdecl) == FIELD_DECL)
2215 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2217 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2218 with that from NEWDECL below. */
2219 if (DECL_LANG_SPECIFIC (olddecl))
2221 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2222 != DECL_LANG_SPECIFIC (newdecl));
2223 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2226 /* Merge the USED information. */
2227 if (TREE_USED (olddecl))
2228 TREE_USED (newdecl) = 1;
2229 else if (TREE_USED (newdecl))
2230 TREE_USED (olddecl) = 1;
2231 if (TREE_CODE (newdecl) == VAR_DECL)
2233 if (DECL_READ_P (olddecl))
2234 DECL_READ_P (newdecl) = 1;
2235 else if (DECL_READ_P (newdecl))
2236 DECL_READ_P (olddecl) = 1;
2238 if (DECL_PRESERVE_P (olddecl))
2239 DECL_PRESERVE_P (newdecl) = 1;
2240 else if (DECL_PRESERVE_P (newdecl))
2241 DECL_PRESERVE_P (olddecl) = 1;
2243 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2247 function_size = sizeof (struct tree_decl_common);
2249 memcpy ((char *) olddecl + sizeof (struct tree_common),
2250 (char *) newdecl + sizeof (struct tree_common),
2251 function_size - sizeof (struct tree_common));
2253 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2254 (char *) newdecl + sizeof (struct tree_decl_common),
2255 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2256 if (new_template_info)
2257 /* If newdecl is a template instantiation, it is possible that
2258 the following sequence of events has occurred:
2260 o A friend function was declared in a class template. The
2261 class template was instantiated.
2263 o The instantiation of the friend declaration was
2264 recorded on the instantiation list, and is newdecl.
2266 o Later, however, instantiate_class_template called pushdecl
2267 on the newdecl to perform name injection. But, pushdecl in
2268 turn called duplicate_decls when it discovered that another
2269 declaration of a global function with the same name already
2272 o Here, in duplicate_decls, we decided to clobber newdecl.
2274 If we're going to do that, we'd better make sure that
2275 olddecl, and not newdecl, is on the list of
2276 instantiations so that if we try to do the instantiation
2277 again we won't get the clobbered declaration. */
2278 reregister_specialization (newdecl,
2284 size_t size = tree_code_size (TREE_CODE (olddecl));
2285 memcpy ((char *) olddecl + sizeof (struct tree_common),
2286 (char *) newdecl + sizeof (struct tree_common),
2287 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2288 switch (TREE_CODE (olddecl))
2298 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2299 (char *) newdecl + sizeof (struct tree_decl_common),
2300 size - sizeof (struct tree_decl_common)
2301 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2305 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2306 (char *) newdecl + sizeof (struct tree_decl_common),
2307 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2308 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2312 DECL_UID (olddecl) = olddecl_uid;
2314 DECL_FRIEND_P (olddecl) = 1;
2317 DECL_ANTICIPATED (olddecl) = 1;
2318 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2321 /* NEWDECL contains the merged attribute lists.
2322 Update OLDDECL to be the same. */
2323 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2325 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2326 so that encode_section_info has a chance to look at the new decl
2327 flags and attributes. */
2328 if (DECL_RTL_SET_P (olddecl)
2329 && (TREE_CODE (olddecl) == FUNCTION_DECL
2330 || (TREE_CODE (olddecl) == VAR_DECL
2331 && TREE_STATIC (olddecl))))
2332 make_decl_rtl (olddecl);
2334 /* The NEWDECL will no longer be needed. Because every out-of-class
2335 declaration of a member results in a call to duplicate_decls,
2336 freeing these nodes represents in a significant savings. */
2342 /* Return zero if the declaration NEWDECL is valid
2343 when the declaration OLDDECL (assumed to be for the same name)
2344 has already been seen.
2345 Otherwise return an error message format string with a %s
2346 where the identifier should go. */
2349 redeclaration_error_message (tree newdecl, tree olddecl)
2351 if (TREE_CODE (newdecl) == TYPE_DECL)
2353 /* Because C++ can put things into name space for free,
2354 constructs like "typedef struct foo { ... } foo"
2355 would look like an erroneous redeclaration. */
2356 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2359 return G_("redefinition of %q#D");
2361 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2363 /* If this is a pure function, its olddecl will actually be
2364 the original initialization to `0' (which we force to call
2365 abort()). Don't complain about redefinition in this case. */
2366 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2367 && DECL_INITIAL (olddecl) == NULL_TREE)
2370 /* If both functions come from different namespaces, this is not
2371 a redeclaration - this is a conflict with a used function. */
2372 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2373 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2374 && ! decls_match (olddecl, newdecl))
2375 return G_("%qD conflicts with used function");
2377 /* We'll complain about linkage mismatches in
2378 warn_extern_redeclared_static. */
2380 /* Defining the same name twice is no good. */
2381 if (DECL_INITIAL (olddecl) != NULL_TREE
2382 && DECL_INITIAL (newdecl) != NULL_TREE)
2384 if (DECL_NAME (olddecl) == NULL_TREE)
2385 return G_("%q#D not declared in class");
2386 else if (!GNU_INLINE_P (olddecl)
2387 || GNU_INLINE_P (newdecl))
2388 return G_("redefinition of %q#D");
2391 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2393 bool olda = GNU_INLINE_P (olddecl);
2394 bool newa = GNU_INLINE_P (newdecl);
2399 return G_("%q+D redeclared inline with "
2400 "%<gnu_inline%> attribute");
2402 return G_("%q+D redeclared inline without "
2403 "%<gnu_inline%> attribute");
2409 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2413 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2415 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2416 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2417 return G_("redefinition of %q#D");
2421 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2422 || (DECL_TEMPLATE_RESULT (newdecl)
2423 == DECL_TEMPLATE_RESULT (olddecl)))
2426 nt = DECL_TEMPLATE_RESULT (newdecl);
2427 if (DECL_TEMPLATE_INFO (nt))
2428 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2429 ot = DECL_TEMPLATE_RESULT (olddecl);
2430 if (DECL_TEMPLATE_INFO (ot))
2431 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2432 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2433 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2434 return G_("redefinition of %q#D");
2436 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2438 bool olda = GNU_INLINE_P (ot);
2439 bool newa = GNU_INLINE_P (nt);
2444 return G_("%q+D redeclared inline with "
2445 "%<gnu_inline%> attribute");
2447 return G_("%q+D redeclared inline without "
2448 "%<gnu_inline%> attribute");
2452 /* Core issue #226 (C++0x):
2454 If a friend function template declaration specifies a
2455 default template-argument, that declaration shall be a
2456 definition and shall be the only declaration of the
2457 function template in the translation unit. */
2458 if ((cxx_dialect != cxx98)
2459 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2460 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2461 /*is_primary=*/1, /*is_partial=*/0,
2462 /*is_friend_decl=*/2))
2463 return G_("redeclaration of friend %q#D "
2464 "may not have default template arguments");
2468 else if (TREE_CODE (newdecl) == VAR_DECL
2469 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2470 && (! DECL_LANG_SPECIFIC (olddecl)
2471 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2472 || DECL_THREAD_LOCAL_P (newdecl)))
2474 /* Only variables can be thread-local, and all declarations must
2475 agree on this property. */
2476 if (DECL_THREAD_LOCAL_P (newdecl))
2477 return G_("thread-local declaration of %q#D follows "
2478 "non-thread-local declaration");
2480 return G_("non-thread-local declaration of %q#D follows "
2481 "thread-local declaration");
2483 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2485 /* The objects have been declared at namespace scope. If either
2486 is a member of an anonymous union, then this is an invalid
2487 redeclaration. For example:
2493 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2494 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2495 return G_("redeclaration of %q#D");
2496 /* If at least one declaration is a reference, there is no
2497 conflict. For example:
2503 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2505 /* Reject two definitions. */
2506 return G_("redefinition of %q#D");
2510 /* Objects declared with block scope: */
2511 /* Reject two definitions, and reject a definition
2512 together with an external reference. */
2513 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2514 return G_("redeclaration of %q#D");
2519 /* Hash and equality functions for the named_label table. */
2522 named_label_entry_hash (const void *data)
2524 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2525 return DECL_UID (ent->label_decl);
2529 named_label_entry_eq (const void *a, const void *b)
2531 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2532 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2533 return ent_a->label_decl == ent_b->label_decl;
2536 /* Create a new label, named ID. */
2539 make_label_decl (tree id, int local_p)
2541 struct named_label_entry *ent;
2545 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2547 DECL_CONTEXT (decl) = current_function_decl;
2548 DECL_MODE (decl) = VOIDmode;
2549 C_DECLARED_LABEL_FLAG (decl) = local_p;
2551 /* Say where one reference is to the label, for the sake of the
2552 error if it is not defined. */
2553 DECL_SOURCE_LOCATION (decl) = input_location;
2555 /* Record the fact that this identifier is bound to this label. */
2556 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2558 /* Create the label htab for the function on demand. */
2560 named_labels = htab_create_ggc (13, named_label_entry_hash,
2561 named_label_entry_eq, NULL);
2563 /* Record this label on the list of labels used in this function.
2564 We do this before calling make_label_decl so that we get the
2565 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2566 ent = ggc_alloc_cleared_named_label_entry ();
2567 ent->label_decl = decl;
2569 slot = htab_find_slot (named_labels, ent, INSERT);
2570 gcc_assert (*slot == NULL);
2576 /* Look for a label named ID in the current function. If one cannot
2577 be found, create one. (We keep track of used, but undefined,
2578 labels, and complain about them at the end of a function.) */
2581 lookup_label_1 (tree id)
2585 /* You can't use labels at global scope. */
2586 if (current_function_decl == NULL_TREE)
2588 error ("label %qE referenced outside of any function", id);
2592 /* See if we've already got this label. */
2593 decl = IDENTIFIER_LABEL_VALUE (id);
2594 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2597 decl = make_label_decl (id, /*local_p=*/0);
2601 /* Wrapper for lookup_label_1. */
2604 lookup_label (tree id)
2607 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2608 ret = lookup_label_1 (id);
2609 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2613 /* Declare a local label named ID. */
2616 declare_local_label (tree id)
2619 cp_label_binding *bind;
2621 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2622 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2623 bind = VEC_safe_push (cp_label_binding, gc,
2624 current_binding_level->shadowed_labels, NULL);
2625 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2627 decl = make_label_decl (id, /*local_p=*/1);
2633 /* Returns nonzero if it is ill-formed to jump past the declaration of
2634 DECL. Returns 2 if it's also a real problem. */
2637 decl_jump_unsafe (tree decl)
2639 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2640 with automatic storage duration is not in scope to a point where it is
2641 in scope is ill-formed unless the variable has scalar type, class type
2642 with a trivial default constructor and a trivial destructor, a
2643 cv-qualified version of one of these types, or an array of one of the
2644 preceding types and is declared without an initializer (8.5). */
2645 tree type = TREE_TYPE (decl);
2647 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2648 || type == error_mark_node)
2651 type = strip_array_types (type);
2653 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2654 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2657 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2663 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2666 identify_goto (tree decl, const location_t *locus)
2669 permerror (input_location, "jump to label %qD", decl);
2671 permerror (input_location, "jump to case label");
2673 permerror (*locus, " from here");
2676 /* Check that a single previously seen jump to a newly defined label
2677 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2678 the jump context; NAMES are the names in scope in LEVEL at the jump
2679 context; LOCUS is the source position of the jump or 0. Returns
2680 true if all is well. */
2683 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2684 bool exited_omp, const location_t *locus)
2686 cp_binding_level *b;
2687 bool identified = false, saw_eh = false, saw_omp = false;
2691 identify_goto (decl, locus);
2692 error (" exits OpenMP structured block");
2693 identified = saw_omp = true;
2696 for (b = current_binding_level; b ; b = b->level_chain)
2698 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2700 for (new_decls = b->names; new_decls != old_decls;
2701 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
2702 : TREE_CHAIN (new_decls)))
2704 int problem = decl_jump_unsafe (new_decls);
2710 identify_goto (decl, locus);
2714 error (" crosses initialization of %q+#D", new_decls);
2716 permerror (input_location, " enters scope of %q+#D which has "
2717 "non-trivial destructor", new_decls);
2722 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2726 identify_goto (decl, locus);
2729 if (b->kind == sk_try)
2730 error (" enters try block");
2732 error (" enters catch block");
2735 if (b->kind == sk_omp && !saw_omp)
2739 identify_goto (decl, locus);
2742 error (" enters OpenMP structured block");
2751 check_previous_goto (tree decl, struct named_label_use_entry *use)
2753 check_previous_goto_1 (decl, use->binding_level,
2754 use->names_in_scope, use->in_omp_scope,
2755 &use->o_goto_locus);
2759 check_switch_goto (cp_binding_level* level)
2761 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2764 /* Check that a new jump to a label DECL is OK. Called by
2765 finish_goto_stmt. */
2768 check_goto (tree decl)
2770 struct named_label_entry *ent, dummy;
2771 bool saw_catch = false, identified = false;
2775 /* We can't know where a computed goto is jumping.
2776 So we assume that it's OK. */
2777 if (TREE_CODE (decl) != LABEL_DECL)
2780 /* We didn't record any information about this label when we created it,
2781 and there's not much point since it's trivial to analyze as a return. */
2782 if (decl == cdtor_label)
2785 dummy.label_decl = decl;
2786 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2787 gcc_assert (ent != NULL);
2789 /* If the label hasn't been defined yet, defer checking. */
2790 if (! DECL_INITIAL (decl))
2792 struct named_label_use_entry *new_use;
2794 /* Don't bother creating another use if the last goto had the
2795 same data, and will therefore create the same set of errors. */
2797 && ent->uses->names_in_scope == current_binding_level->names)
2800 new_use = ggc_alloc_named_label_use_entry ();
2801 new_use->binding_level = current_binding_level;
2802 new_use->names_in_scope = current_binding_level->names;
2803 new_use->o_goto_locus = input_location;
2804 new_use->in_omp_scope = false;
2806 new_use->next = ent->uses;
2807 ent->uses = new_use;
2811 if (ent->in_try_scope || ent->in_catch_scope
2812 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2814 permerror (input_location, "jump to label %q+D", decl);
2815 permerror (input_location, " from here");
2819 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2821 int u = decl_jump_unsafe (bad);
2823 if (u > 1 && DECL_ARTIFICIAL (bad))
2825 /* Can't skip init of __exception_info. */
2826 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2830 error (" skips initialization of %q+#D", bad);
2832 permerror (input_location, " enters scope of %q+#D which has "
2833 "non-trivial destructor", bad);
2836 if (ent->in_try_scope)
2837 error (" enters try block");
2838 else if (ent->in_catch_scope && !saw_catch)
2839 error (" enters catch block");
2841 if (ent->in_omp_scope)
2842 error (" enters OpenMP structured block");
2843 else if (flag_openmp)
2845 cp_binding_level *b;
2846 for (b = current_binding_level; b ; b = b->level_chain)
2848 if (b == ent->binding_level)
2850 if (b->kind == sk_omp)
2854 permerror (input_location, "jump to label %q+D", decl);
2855 permerror (input_location, " from here");
2858 error (" exits OpenMP structured block");
2865 /* Check that a return is ok wrt OpenMP structured blocks.
2866 Called by finish_return_stmt. Returns true if all is well. */
2869 check_omp_return (void)
2871 cp_binding_level *b;
2872 for (b = current_binding_level; b ; b = b->level_chain)
2873 if (b->kind == sk_omp)
2875 error ("invalid exit from OpenMP structured block");
2878 else if (b->kind == sk_function_parms)
2883 /* Define a label, specifying the location in the source file.
2884 Return the LABEL_DECL node for the label. */
2887 define_label_1 (location_t location, tree name)
2889 struct named_label_entry *ent, dummy;
2890 cp_binding_level *p;
2893 decl = lookup_label (name);
2895 dummy.label_decl = decl;
2896 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2897 gcc_assert (ent != NULL);
2899 /* After labels, make any new cleanups in the function go into their
2900 own new (temporary) binding contour. */
2901 for (p = current_binding_level;
2902 p->kind != sk_function_parms;
2904 p->more_cleanups_ok = 0;
2906 if (name == get_identifier ("wchar_t"))
2907 permerror (input_location, "label named wchar_t");
2909 if (DECL_INITIAL (decl) != NULL_TREE)
2911 error ("duplicate label %qD", decl);
2912 return error_mark_node;
2916 struct named_label_use_entry *use;
2918 /* Mark label as having been defined. */
2919 DECL_INITIAL (decl) = error_mark_node;
2920 /* Say where in the source. */
2921 DECL_SOURCE_LOCATION (decl) = location;
2923 ent->binding_level = current_binding_level;
2924 ent->names_in_scope = current_binding_level->names;
2926 for (use = ent->uses; use ; use = use->next)
2927 check_previous_goto (decl, use);
2934 /* Wrapper for define_label_1. */
2937 define_label (location_t location, tree name)
2940 timevar_start (TV_NAME_LOOKUP);
2941 ret = define_label_1 (location, name);
2942 timevar_stop (TV_NAME_LOOKUP);
2949 cp_binding_level *level;
2950 struct cp_switch *next;
2951 /* The SWITCH_STMT being built. */
2953 /* A splay-tree mapping the low element of a case range to the high
2954 element, or NULL_TREE if there is no high element. Used to
2955 determine whether or not a new case label duplicates an old case
2956 label. We need a tree, rather than simply a hash table, because
2957 of the GNU case range extension. */
2961 /* A stack of the currently active switch statements. The innermost
2962 switch statement is on the top of the stack. There is no need to
2963 mark the stack for garbage collection because it is only active
2964 during the processing of the body of a function, and we never
2965 collect at that point. */
2967 static struct cp_switch *switch_stack;
2969 /* Called right after a switch-statement condition is parsed.
2970 SWITCH_STMT is the switch statement being parsed. */
2973 push_switch (tree switch_stmt)
2975 struct cp_switch *p = XNEW (struct cp_switch);
2976 p->level = current_binding_level;
2977 p->next = switch_stack;
2978 p->switch_stmt = switch_stmt;
2979 p->cases = splay_tree_new (case_compare, NULL, NULL);
2986 struct cp_switch *cs = switch_stack;
2987 location_t switch_location;
2989 /* Emit warnings as needed. */
2990 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2991 if (!processing_template_decl)
2992 c_do_switch_warnings (cs->cases, switch_location,
2993 SWITCH_STMT_TYPE (cs->switch_stmt),
2994 SWITCH_STMT_COND (cs->switch_stmt));
2996 splay_tree_delete (cs->cases);
2997 switch_stack = switch_stack->next;
3001 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3002 condition. Note that if TYPE and VALUE are already integral we don't
3003 really do the conversion because the language-independent
3004 warning/optimization code will work better that way. */
3007 case_conversion (tree type, tree value)
3009 if (value == NULL_TREE)
3012 if (cxx_dialect >= cxx0x
3013 && (SCOPED_ENUM_P (type)
3014 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3016 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3017 type = type_promotes_to (type);
3018 value = perform_implicit_conversion (type, value, tf_warning_or_error);
3020 return cxx_constant_value (value);
3023 /* Note that we've seen a definition of a case label, and complain if this
3024 is a bad place for one. */
3027 finish_case_label (location_t loc, tree low_value, tree high_value)
3030 cp_binding_level *p;
3033 if (processing_template_decl)
3037 /* For templates, just add the case label; we'll do semantic
3038 analysis at instantiation-time. */
3039 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3040 return add_stmt (build_case_label (low_value, high_value, label));
3043 /* Find the condition on which this switch statement depends. */
3044 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3045 if (cond && TREE_CODE (cond) == TREE_LIST)
3046 cond = TREE_VALUE (cond);
3048 if (!check_switch_goto (switch_stack->level))
3049 return error_mark_node;
3051 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3053 low_value = case_conversion (type, low_value);
3054 high_value = case_conversion (type, high_value);
3056 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3057 low_value, high_value);
3059 /* After labels, make any new cleanups in the function go into their
3060 own new (temporary) binding contour. */
3061 for (p = current_binding_level;
3062 p->kind != sk_function_parms;
3064 p->more_cleanups_ok = 0;
3069 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3072 typename_hash (const void* k)
3075 const_tree const t = (const_tree) k;
3077 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3078 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3083 typedef struct typename_info {
3091 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3092 really of type `typename_info*' */
3095 typename_compare (const void * k1, const void * k2)
3097 const_tree const t1 = (const_tree) k1;
3098 const typename_info *const t2 = (const typename_info *) k2;
3100 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3101 && TYPE_CONTEXT (t1) == t2->scope
3102 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3103 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3104 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3107 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3108 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3110 Returns the new TYPENAME_TYPE. */
3112 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3115 build_typename_type (tree context, tree name, tree fullname,
3116 enum tag_types tag_type)
3124 if (typename_htab == NULL)
3125 typename_htab = htab_create_ggc (61, &typename_hash,
3126 &typename_compare, NULL);
3128 ti.scope = FROB_CONTEXT (context);
3130 ti.template_id = fullname;
3131 ti.enum_p = tag_type == enum_type;
3132 ti.class_p = (tag_type == class_type
3133 || tag_type == record_type
3134 || tag_type == union_type);
3135 hash = (htab_hash_pointer (ti.scope)
3136 ^ htab_hash_pointer (ti.name));
3138 /* See if we already have this type. */
3139 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3144 /* Build the TYPENAME_TYPE. */
3145 t = cxx_make_type (TYPENAME_TYPE);
3146 TYPE_CONTEXT (t) = ti.scope;
3147 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3148 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3149 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3151 /* Build the corresponding TYPE_DECL. */
3152 d = build_decl (input_location, TYPE_DECL, name, t);
3153 TYPE_NAME (TREE_TYPE (d)) = d;
3154 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3155 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3156 DECL_ARTIFICIAL (d) = 1;
3158 /* Store it in the hash table. */
3161 /* TYPENAME_TYPEs must always be compared structurally, because
3162 they may or may not resolve down to another type depending on
3163 the currently open classes. */
3164 SET_TYPE_STRUCTURAL_EQUALITY (t);
3170 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3171 provided to name the type. Returns an appropriate type, unless an
3172 error occurs, in which case error_mark_node is returned. If we
3173 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3174 return that, rather than the _TYPE it corresponds to, in other
3175 cases we look through the type decl. If TF_ERROR is set, complain
3176 about errors, otherwise be quiet. */
3179 make_typename_type (tree context, tree name, enum tag_types tag_type,
3180 tsubst_flags_t complain)
3186 if (name == error_mark_node
3187 || context == NULL_TREE
3188 || context == error_mark_node)
3189 return error_mark_node;
3193 if (!(TYPE_LANG_SPECIFIC (name)
3194 && (CLASSTYPE_IS_TEMPLATE (name)
3195 || CLASSTYPE_USE_TEMPLATE (name))))
3196 name = TYPE_IDENTIFIER (name);
3198 /* Create a TEMPLATE_ID_EXPR for the type. */
3199 name = build_nt (TEMPLATE_ID_EXPR,
3200 CLASSTYPE_TI_TEMPLATE (name),
3201 CLASSTYPE_TI_ARGS (name));
3203 else if (TREE_CODE (name) == TYPE_DECL)
3204 name = DECL_NAME (name);
3208 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3210 name = TREE_OPERAND (name, 0);
3211 if (TREE_CODE (name) == TEMPLATE_DECL)
3212 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3213 else if (TREE_CODE (name) == OVERLOAD)
3215 error ("%qD is not a type", name);
3216 return error_mark_node;
3219 if (TREE_CODE (name) == TEMPLATE_DECL)
3221 error ("%qD used without template parameters", name);
3222 return error_mark_node;
3224 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3225 gcc_assert (TYPE_P (context));
3227 if (!MAYBE_CLASS_TYPE_P (context))
3229 if (complain & tf_error)
3230 error ("%q#T is not a class", context);
3231 return error_mark_node;
3234 /* When the CONTEXT is a dependent type, NAME could refer to a
3235 dependent base class of CONTEXT. But look inside it anyway
3236 if CONTEXT is a currently open scope, in case it refers to a
3237 member of the current instantiation or a non-dependent base;
3238 lookup will stop when we hit a dependent base. */
3239 if (!dependent_scope_p (context))
3240 /* We should only set WANT_TYPE when we're a nested typename type.
3241 Then we can give better diagnostics if we find a non-type. */
3242 t = lookup_field (context, name, 2, /*want_type=*/true);
3246 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3247 return build_typename_type (context, name, fullname, tag_type);
3249 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3253 if (complain & tf_error)
3254 error (want_template ? G_("no class template named %q#T in %q#T")
3255 : G_("no type named %q#T in %q#T"), name, context);
3256 return error_mark_node;
3259 /* Pull out the template from an injected-class-name (or multiple). */
3261 t = maybe_get_template_decl_from_type_decl (t);
3263 if (TREE_CODE (t) == TREE_LIST)
3265 if (complain & tf_error)
3267 error ("lookup of %qT in %qT is ambiguous", name, context);
3268 print_candidates (t);
3270 return error_mark_node;
3273 if (want_template && !DECL_TYPE_TEMPLATE_P (t))
3275 if (complain & tf_error)
3276 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3278 return error_mark_node;
3280 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3282 if (complain & tf_error)
3283 error ("%<typename %T::%D%> names %q#T, which is not a type",
3285 return error_mark_node;
3288 if (complain & tf_error)
3289 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3291 /* If we are currently parsing a template and if T is a typedef accessed
3292 through CONTEXT then we need to remember and check access of T at
3293 template instantiation time. */
3294 add_typedef_to_current_template_for_access_check (t, context, input_location);
3297 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3299 /*entering_scope=*/0,
3300 tf_warning_or_error | tf_user);
3302 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3308 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3309 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3310 in which case error_mark_node is returned.
3312 If PARM_LIST is non-NULL, also make sure that the template parameter
3313 list of TEMPLATE_DECL matches.
3315 If COMPLAIN zero, don't complain about any errors that occur. */
3318 make_unbound_class_template (tree context, tree name, tree parm_list,
3319 tsubst_flags_t complain)
3325 name = TYPE_IDENTIFIER (name);
3326 else if (DECL_P (name))
3327 name = DECL_NAME (name);
3328 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3330 if (!dependent_type_p (context)
3331 || currently_open_class (context))
3333 tree tmpl = NULL_TREE;
3335 if (MAYBE_CLASS_TYPE_P (context))
3336 tmpl = lookup_field (context, name, 0, false);
3338 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3339 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3341 if (!tmpl || !DECL_TYPE_TEMPLATE_P (tmpl))
3343 if (complain & tf_error)
3344 error ("no class template named %q#T in %q#T", name, context);
3345 return error_mark_node;
3349 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3351 if (complain & tf_error)
3353 error ("template parameters do not match template");
3354 error ("%q+D declared here", tmpl);
3356 return error_mark_node;
3359 if (complain & tf_error)
3360 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3365 /* Build the UNBOUND_CLASS_TEMPLATE. */
3366 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3367 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3368 TREE_TYPE (t) = NULL_TREE;
3369 SET_TYPE_STRUCTURAL_EQUALITY (t);
3371 /* Build the corresponding TEMPLATE_DECL. */
3372 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3373 TYPE_NAME (TREE_TYPE (d)) = d;
3374 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3375 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3376 DECL_ARTIFICIAL (d) = 1;
3377 DECL_TEMPLATE_PARMS (d) = parm_list;
3384 /* Push the declarations of builtin types into the namespace.
3385 RID_INDEX is the index of the builtin type in the array
3386 RID_POINTERS. NAME is the name used when looking up the builtin
3387 type. TYPE is the _TYPE node for the builtin type. */
3390 record_builtin_type (enum rid rid_index,
3394 tree rname = NULL_TREE, tname = NULL_TREE;
3395 tree tdecl = NULL_TREE;
3397 if ((int) rid_index < (int) RID_MAX)
3398 rname = ridpointers[(int) rid_index];
3400 tname = get_identifier (name);
3402 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3403 eliminated. Built-in types should not be looked up name; their
3404 names are keywords that the parser can recognize. However, there
3405 is code in c-common.c that uses identifier_global_value to look
3406 up built-in types by name. */
3409 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3410 DECL_ARTIFICIAL (tdecl) = 1;
3411 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3417 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3418 DECL_ARTIFICIAL (tdecl) = 1;
3420 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3423 if (!TYPE_NAME (type))
3424 TYPE_NAME (type) = tdecl;
3427 debug_hooks->type_decl (tdecl, 0);
3430 /* Record one of the standard Java types.
3431 * Declare it as having the given NAME.
3432 * If SIZE > 0, it is the size of one of the integral types;
3433 * otherwise it is the negative of the size of one of the other types. */
3436 record_builtin_java_type (const char* name, int size)
3441 type = build_nonstandard_integer_type (size, 0);
3442 type = build_distinct_type_copy (type);
3444 else if (size > -32)
3447 /* "__java_char" or ""__java_boolean". */
3448 type = build_nonstandard_integer_type (-size, 1);
3449 type = build_distinct_type_copy (type);
3450 /* Get the signed type cached and attached to the unsigned type,
3451 so it doesn't get garbage-collected at "random" times,
3452 causing potential codegen differences out of different UIDs
3453 and different alias set numbers. */
3454 stype = build_nonstandard_integer_type (-size, 0);
3455 stype = build_distinct_type_copy (stype);
3456 TREE_CHAIN (type) = stype;
3457 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3460 { /* "__java_float" or ""__java_double". */
3461 type = make_node (REAL_TYPE);
3462 TYPE_PRECISION (type) = - size;
3465 record_builtin_type (RID_MAX, name, type);
3466 decl = TYPE_NAME (type);
3468 /* Suppress generate debug symbol entries for these types,
3469 since for normal C++ they are just clutter.
3470 However, push_lang_context undoes this if extern "Java" is seen. */
3471 DECL_IGNORED_P (decl) = 1;
3473 TYPE_FOR_JAVA (type) = 1;
3477 /* Push a type into the namespace so that the back ends ignore it. */
3480 record_unknown_type (tree type, const char* name)
3482 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3483 TYPE_DECL, get_identifier (name), type));
3484 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3485 DECL_IGNORED_P (decl) = 1;
3486 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3487 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3488 TYPE_ALIGN (type) = 1;
3489 TYPE_USER_ALIGN (type) = 0;
3490 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3493 /* A string for which we should create an IDENTIFIER_NODE at
3496 typedef struct predefined_identifier
3498 /* The name of the identifier. */
3499 const char *const name;
3500 /* The place where the IDENTIFIER_NODE should be stored. */
3502 /* Nonzero if this is the name of a constructor or destructor. */
3503 const int ctor_or_dtor_p;
3504 } predefined_identifier;
3506 /* Create all the predefined identifiers. */
3509 initialize_predefined_identifiers (void)
3511 const predefined_identifier *pid;
3513 /* A table of identifiers to create at startup. */
3514 static const predefined_identifier predefined_identifiers[] = {
3515 { "C++", &lang_name_cplusplus, 0 },
3516 { "C", &lang_name_c, 0 },
3517 { "Java", &lang_name_java, 0 },
3518 /* Some of these names have a trailing space so that it is
3519 impossible for them to conflict with names written by users. */
3520 { "__ct ", &ctor_identifier, 1 },
3521 { "__base_ctor ", &base_ctor_identifier, 1 },
3522 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3523 { "__dt ", &dtor_identifier, 1 },
3524 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3525 { "__base_dtor ", &base_dtor_identifier, 1 },
3526 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3527 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3528 { "nelts", &nelts_identifier, 0 },
3529 { THIS_NAME, &this_identifier, 0 },
3530 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3531 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3532 { "_vptr", &vptr_identifier, 0 },
3533 { "__vtt_parm", &vtt_parm_identifier, 0 },
3534 { "::", &global_scope_name, 0 },
3535 { "std", &std_identifier, 0 },
3539 for (pid = predefined_identifiers; pid->name; ++pid)
3541 *pid->node = get_identifier (pid->name);
3542 if (pid->ctor_or_dtor_p)
3543 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3547 /* Create the predefined scalar types of C,
3548 and some nodes representing standard constants (0, 1, (void *)0).
3549 Initialize the global binding level.
3550 Make definitions for built-in primitive functions. */
3553 cxx_init_decl_processing (void)
3556 tree void_ftype_ptr;
3558 /* Create all the identifiers we need. */
3559 initialize_predefined_identifiers ();
3561 /* Create the global variables. */
3562 push_to_top_level ();
3564 current_function_decl = NULL_TREE;
3565 current_binding_level = NULL;
3566 /* Enter the global namespace. */
3567 gcc_assert (global_namespace == NULL_TREE);
3568 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3570 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3571 TREE_PUBLIC (global_namespace) = 1;
3572 begin_scope (sk_namespace, global_namespace);
3574 if (flag_visibility_ms_compat)
3575 default_visibility = VISIBILITY_HIDDEN;
3578 current_lang_name = lang_name_c;
3580 /* Create the `std' namespace. */
3581 push_namespace (std_identifier);
3582 std_node = current_namespace;
3585 c_common_nodes_and_builtins ();
3587 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3588 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3589 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3590 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3591 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3592 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3593 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3594 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3596 integer_two_node = build_int_cst (NULL_TREE, 2);
3598 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3599 truthvalue_type_node = boolean_type_node;
3600 truthvalue_false_node = boolean_false_node;
3601 truthvalue_true_node = boolean_true_node;
3603 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3604 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3605 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3608 record_builtin_type (RID_MAX, NULL, string_type_node);
3611 delta_type_node = ptrdiff_type_node;
3612 vtable_index_type = ptrdiff_type_node;
3614 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3615 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3616 void_ftype_ptr = build_function_type_list (void_type_node,
3617 ptr_type_node, NULL_TREE);
3619 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3621 /* C++ extensions */
3623 unknown_type_node = make_node (LANG_TYPE);
3624 record_unknown_type (unknown_type_node, "unknown type");
3626 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3627 TREE_TYPE (unknown_type_node) = unknown_type_node;
3629 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3631 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3632 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3634 init_list_type_node = make_node (LANG_TYPE);
3635 record_unknown_type (init_list_type_node, "init list");
3637 dependent_lambda_return_type_node = make_node (LANG_TYPE);
3638 record_unknown_type (dependent_lambda_return_type_node,
3639 "undeduced lambda return type");
3642 /* Make sure we get a unique function type, so we can give
3643 its pointer type a name. (This wins for gdb.) */
3644 tree vfunc_type = make_node (FUNCTION_TYPE);
3645 TREE_TYPE (vfunc_type) = integer_type_node;
3646 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3647 layout_type (vfunc_type);
3649 vtable_entry_type = build_pointer_type (vfunc_type);
3651 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3654 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3655 layout_type (vtbl_type_node);
3656 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3657 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3658 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3659 layout_type (vtbl_ptr_type_node);
3660 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3662 push_namespace (get_identifier ("__cxxabiv1"));
3663 abi_node = current_namespace;
3666 global_type_node = make_node (LANG_TYPE);
3667 record_unknown_type (global_type_node, "global type");
3670 current_lang_name = lang_name_cplusplus;
3673 tree newattrs, extvisattr;
3674 tree newtype, deltype;
3675 tree ptr_ftype_sizetype;
3679 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3680 if (cxx_dialect == cxx98)
3683 tree bad_alloc_type_node;
3684 tree bad_alloc_decl;
3686 push_namespace (std_identifier);
3687 bad_alloc_id = get_identifier ("bad_alloc");
3688 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3689 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3691 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3692 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3696 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3699 new_eh_spec = noexcept_false_spec;
3701 /* Ensure attribs.c is initialized. */
3703 extvisattr = build_tree_list (get_identifier ("externally_visible"),
3705 newattrs = tree_cons (get_identifier ("alloc_size"),
3706 build_tree_list (NULL_TREE, integer_one_node),
3708 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3709 newtype = build_exception_variant (newtype, new_eh_spec);
3710 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
3711 deltype = build_exception_variant (deltype, empty_except_spec);
3712 push_cp_library_fn (NEW_EXPR, newtype);
3713 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3714 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3715 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3717 nullptr_type_node = make_node (NULLPTR_TYPE);
3718 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3719 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3720 TYPE_UNSIGNED (nullptr_type_node) = 1;
3721 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3722 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3723 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3724 nullptr_node = build_int_cst (nullptr_type_node, 0);
3728 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3730 /* Perform other language dependent initializations. */
3731 init_class_processing ();
3732 init_rtti_processing ();
3733 init_template_processing ();
3735 if (flag_exceptions)
3736 init_exception_processing ();
3738 if (! supports_one_only ())
3741 make_fname_decl = cp_make_fname_decl;
3742 start_fname_decls ();
3744 /* Show we use EH for cleanups. */
3745 if (flag_exceptions)
3746 using_eh_for_cleanups ();
3749 /* Generate an initializer for a function naming variable from
3750 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3751 filled in with the type of the init. */
3754 cp_fname_init (const char* name, tree *type_p)
3756 tree domain = NULL_TREE;
3758 tree init = NULL_TREE;
3763 length = strlen (name);
3764 domain = build_index_type (size_int (length));
3765 init = build_string (length + 1, name);
3768 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3769 type = build_cplus_array_type (type, domain);
3774 TREE_TYPE (init) = type;
3776 init = error_mark_node;
3781 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3782 the decl, LOC is the location to give the decl, NAME is the
3783 initialization string and TYPE_DEP indicates whether NAME depended
3784 on the type of the function. We make use of that to detect
3785 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3786 at the point of first use, so we mustn't push the decl now. */
3789 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3791 const char *const name = (type_dep && processing_template_decl
3792 ? NULL : fname_as_string (type_dep));
3794 tree init = cp_fname_init (name, &type);
3795 tree decl = build_decl (loc, VAR_DECL, id, type);
3798 free (CONST_CAST (char *, name));
3800 /* As we're using pushdecl_with_scope, we must set the context. */
3801 DECL_CONTEXT (decl) = current_function_decl;
3802 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3804 TREE_STATIC (decl) = 1;
3805 TREE_READONLY (decl) = 1;
3806 DECL_ARTIFICIAL (decl) = 1;
3808 TREE_USED (decl) = 1;
3810 if (current_function_decl)
3812 cp_binding_level *b = current_binding_level;
3813 if (b->kind == sk_function_parms)
3814 return error_mark_node;
3815 while (b->level_chain->kind != sk_function_parms)
3817 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3818 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3819 LOOKUP_ONLYCONVERTING);
3823 DECL_THIS_STATIC (decl) = true;
3824 pushdecl_top_level_and_finish (decl, init);
3831 builtin_function_1 (tree decl, tree context, bool is_global)
3833 tree id = DECL_NAME (decl);
3834 const char *name = IDENTIFIER_POINTER (id);
3836 retrofit_lang_decl (decl);
3838 DECL_ARTIFICIAL (decl) = 1;
3839 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3840 SET_DECL_LANGUAGE (decl, lang_c);
3841 /* Runtime library routines are, by definition, available in an
3842 external shared object. */
3843 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3844 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3846 DECL_CONTEXT (decl) = context;
3849 pushdecl_top_level (decl);
3853 /* A function in the user's namespace should have an explicit
3854 declaration before it is used. Mark the built-in function as
3855 anticipated but not actually declared. */
3856 if (name[0] != '_' || name[1] != '_')
3857 DECL_ANTICIPATED (decl) = 1;
3858 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3860 size_t len = strlen (name);
3862 /* Treat __*_chk fortification functions as anticipated as well,
3863 unless they are __builtin_*. */
3864 if (len > strlen ("___chk")
3865 && memcmp (name + len - strlen ("_chk"),
3866 "_chk", strlen ("_chk") + 1) == 0)
3867 DECL_ANTICIPATED (decl) = 1;
3874 cxx_builtin_function (tree decl)
3876 tree id = DECL_NAME (decl);
3877 const char *name = IDENTIFIER_POINTER (id);
3878 /* All builtins that don't begin with an '_' should additionally
3879 go in the 'std' namespace. */
3882 tree decl2 = copy_node(decl);
3883 push_namespace (std_identifier);
3884 builtin_function_1 (decl2, std_node, false);
3888 return builtin_function_1 (decl, NULL_TREE, false);
3891 /* Like cxx_builtin_function, but guarantee the function is added to the global
3892 scope. This is to allow function specific options to add new machine
3893 dependent builtins when the target ISA changes via attribute((target(...)))
3894 which saves space on program startup if the program does not use non-generic
3898 cxx_builtin_function_ext_scope (tree decl)
3901 tree id = DECL_NAME (decl);
3902 const char *name = IDENTIFIER_POINTER (id);
3903 /* All builtins that don't begin with an '_' should additionally
3904 go in the 'std' namespace. */
3907 tree decl2 = copy_node(decl);
3908 push_namespace (std_identifier);
3909 builtin_function_1 (decl2, std_node, true);
3913 return builtin_function_1 (decl, NULL_TREE, true);
3916 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3917 function. Not called directly. */
3920 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3922 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3923 DECL_EXTERNAL (fn) = 1;
3924 TREE_PUBLIC (fn) = 1;
3925 DECL_ARTIFICIAL (fn) = 1;
3926 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3927 SET_DECL_LANGUAGE (fn, lang_c);
3928 /* Runtime library routines are, by definition, available in an
3929 external shared object. */
3930 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3931 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3935 /* Returns the _DECL for a library function with C linkage.
3936 We assume that such functions never throw; if this is incorrect,
3937 callers should unset TREE_NOTHROW. */
3940 build_library_fn (tree name, tree type)
3942 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3943 TREE_NOTHROW (fn) = 1;
3947 /* Returns the _DECL for a library function with C++ linkage. */
3950 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3952 tree fn = build_library_fn_1 (name, operator_code, type);
3953 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3954 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3955 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3959 /* Like build_library_fn, but takes a C string instead of an
3963 build_library_fn_ptr (const char* name, tree type)
3965 return build_library_fn (get_identifier (name), type);
3968 /* Like build_cp_library_fn, but takes a C string instead of an
3972 build_cp_library_fn_ptr (const char* name, tree type)
3974 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3977 /* Like build_library_fn, but also pushes the function so that we will
3978 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3979 may throw exceptions listed in RAISES. */
3982 push_library_fn (tree name, tree type, tree raises)
3987 type = build_exception_variant (type, raises);
3989 fn = build_library_fn (name, type);
3990 pushdecl_top_level (fn);
3994 /* Like build_cp_library_fn, but also pushes the function so that it
3995 will be found by normal lookup. */
3998 push_cp_library_fn (enum tree_code operator_code, tree type)
4000 tree fn = build_cp_library_fn (ansi_opname (operator_code),
4007 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4011 push_void_library_fn (tree name, tree parmtypes)
4013 tree type = build_function_type (void_type_node, parmtypes);
4014 return push_library_fn (name, type, NULL_TREE);
4017 /* Like push_library_fn, but also note that this function throws
4018 and does not return. Used for __throw_foo and the like. */
4021 push_throw_library_fn (tree name, tree type)
4023 tree fn = push_library_fn (name, type, NULL_TREE);
4024 TREE_THIS_VOLATILE (fn) = 1;
4025 TREE_NOTHROW (fn) = 0;
4029 /* When we call finish_struct for an anonymous union, we create
4030 default copy constructors and such. But, an anonymous union
4031 shouldn't have such things; this function undoes the damage to the
4032 anonymous union type T.
4034 (The reason that we create the synthesized methods is that we don't
4035 distinguish `union { int i; }' from `typedef union { int i; } U'.
4036 The first is an anonymous union; the second is just an ordinary
4040 fixup_anonymous_aggr (tree t)
4044 /* Wipe out memory of synthesized methods. */
4045 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4046 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4047 TYPE_HAS_COPY_CTOR (t) = 0;
4048 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4049 TYPE_HAS_COPY_ASSIGN (t) = 0;
4050 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4052 /* Splice the implicitly generated functions out of the TYPE_METHODS
4054 q = &TYPE_METHODS (t);
4057 if (DECL_ARTIFICIAL (*q))
4058 *q = TREE_CHAIN (*q);
4060 q = &DECL_CHAIN (*q);
4063 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4064 if (TYPE_METHODS (t))
4066 tree decl = TYPE_MAIN_DECL (t);
4068 if (TREE_CODE (t) != UNION_TYPE)
4069 error_at (DECL_SOURCE_LOCATION (decl),
4070 "an anonymous struct cannot have function members");
4072 error_at (DECL_SOURCE_LOCATION (decl),
4073 "an anonymous union cannot have function members");
4076 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4077 assignment operators (because they cannot have these methods themselves).
4078 For anonymous unions this is already checked because they are not allowed
4079 in any union, otherwise we have to check it. */
4080 if (TREE_CODE (t) != UNION_TYPE)
4084 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4085 if (TREE_CODE (field) == FIELD_DECL)
4087 type = TREE_TYPE (field);
4088 if (CLASS_TYPE_P (type))
4090 if (TYPE_NEEDS_CONSTRUCTING (type))
4091 error ("member %q+#D with constructor not allowed "
4092 "in anonymous aggregate", field);
4093 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4094 error ("member %q+#D with destructor not allowed "
4095 "in anonymous aggregate", field);
4096 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4097 error ("member %q+#D with copy assignment operator "
4098 "not allowed in anonymous aggregate", field);
4104 /* Make sure that a declaration with no declarator is well-formed, i.e.
4105 just declares a tagged type or anonymous union.
4107 Returns the type declared; or NULL_TREE if none. */
4110 check_tag_decl (cp_decl_specifier_seq *declspecs)
4112 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4113 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4114 /* If a class, struct, or enum type is declared by the DECLSPECS
4115 (i.e, if a class-specifier, enum-specifier, or non-typename
4116 elaborated-type-specifier appears in the DECLSPECS),
4117 DECLARED_TYPE is set to the corresponding type. */
4118 tree declared_type = NULL_TREE;
4119 bool error_p = false;
4121 if (declspecs->multiple_types_p)
4122 error ("multiple types in one declaration");
4123 else if (declspecs->redefined_builtin_type)
4125 if (!in_system_header)
4126 permerror (input_location, "redeclaration of C++ built-in type %qT",
4127 declspecs->redefined_builtin_type);
4132 && TYPE_P (declspecs->type)
4133 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4134 && MAYBE_CLASS_TYPE_P (declspecs->type))
4135 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4136 declared_type = declspecs->type;
4137 else if (declspecs->type == error_mark_node)
4139 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4140 permerror (input_location, "declaration does not declare anything");
4141 /* Check for an anonymous union. */
4142 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4143 && TYPE_ANONYMOUS_P (declared_type))
4145 /* 7/3 In a simple-declaration, the optional init-declarator-list
4146 can be omitted only when declaring a class (clause 9) or
4147 enumeration (7.2), that is, when the decl-specifier-seq contains
4148 either a class-specifier, an elaborated-type-specifier with
4149 a class-key (9.1), or an enum-specifier. In these cases and
4150 whenever a class-specifier or enum-specifier is present in the
4151 decl-specifier-seq, the identifiers in these specifiers are among
4152 the names being declared by the declaration (as class-name,
4153 enum-names, or enumerators, depending on the syntax). In such
4154 cases, and except for the declaration of an unnamed bit-field (9.6),
4155 the decl-specifier-seq shall introduce one or more names into the
4156 program, or shall redeclare a name introduced by a previous
4157 declaration. [Example:
4158 enum { }; // ill-formed
4159 typedef class { }; // ill-formed
4163 error ("missing type-name in typedef-declaration");
4166 /* Anonymous unions are objects, so they can have specifiers. */;
4167 SET_ANON_AGGR_TYPE_P (declared_type);
4169 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4170 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4175 if (declspecs->specs[(int)ds_inline]
4176 || declspecs->specs[(int)ds_virtual])
4177 error ("%qs can only be specified for functions",
4178 declspecs->specs[(int)ds_inline]
4179 ? "inline" : "virtual");
4181 && (!current_class_type
4182 || current_scope () != current_class_type))
4183 error ("%<friend%> can only be specified inside a class");
4184 else if (declspecs->specs[(int)ds_explicit])
4185 error ("%<explicit%> can only be specified for constructors");
4186 else if (declspecs->storage_class)
4187 error ("a storage class can only be specified for objects "
4189 else if (declspecs->specs[(int)ds_const]
4190 || declspecs->specs[(int)ds_volatile]
4191 || declspecs->specs[(int)ds_restrict]
4192 || declspecs->specs[(int)ds_thread])
4193 error ("qualifiers can only be specified for objects "
4195 else if (saw_typedef)
4196 warning (0, "%<typedef%> was ignored in this declaration");
4197 else if (declspecs->specs[(int) ds_constexpr])
4198 error ("%<constexpr%> cannot be used for type declarations");
4201 return declared_type;
4204 /* Called when a declaration is seen that contains no names to declare.
4205 If its type is a reference to a structure, union or enum inherited
4206 from a containing scope, shadow that tag name for the current scope
4207 with a forward reference.
4208 If its type defines a new named structure or union
4209 or defines an enum, it is valid but we need not do anything here.
4210 Otherwise, it is an error.
4212 C++: may have to grok the declspecs to learn about static,
4213 complain for anonymous unions.
4215 Returns the TYPE declared -- or NULL_TREE if none. */
4218 shadow_tag (cp_decl_specifier_seq *declspecs)
4220 tree t = check_tag_decl (declspecs);
4225 if (declspecs->attributes)
4227 warning (0, "attribute ignored in declaration of %q+#T", t);
4228 warning (0, "attribute for %q+#T must follow the %qs keyword",
4229 t, class_key_or_enum_as_string (t));
4233 if (maybe_process_partial_specialization (t) == error_mark_node)
4236 /* This is where the variables in an anonymous union are
4237 declared. An anonymous union declaration looks like:
4239 because there is no declarator after the union, the parser
4240 sends that declaration here. */
4241 if (ANON_AGGR_TYPE_P (t))
4243 fixup_anonymous_aggr (t);
4245 if (TYPE_FIELDS (t))
4247 tree decl = grokdeclarator (/*declarator=*/NULL,
4248 declspecs, NORMAL, 0, NULL);
4249 finish_anon_union (decl);
4256 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4259 groktypename (cp_decl_specifier_seq *type_specifiers,
4260 const cp_declarator *declarator,
4261 bool is_template_arg)
4265 enum decl_context context
4266 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4267 attrs = type_specifiers->attributes;
4268 type_specifiers->attributes = NULL_TREE;
4269 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4270 if (attrs && type != error_mark_node)
4272 if (CLASS_TYPE_P (type))
4273 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4274 "outside of definition", type);
4275 else if (MAYBE_CLASS_TYPE_P (type))
4276 /* A template type parameter or other dependent type. */
4277 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4278 "type %qT without an associated declaration", type);
4280 cplus_decl_attributes (&type, attrs, 0);
4285 /* Process a DECLARATOR for a function-scope variable declaration,
4286 namespace-scope variable declaration, or function declaration.
4287 (Function definitions go through start_function; class member
4288 declarations appearing in the body of the class go through
4289 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4290 If an error occurs, the error_mark_node is returned instead.
4292 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4293 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4294 for an explicitly defaulted function, or SD_DELETED for an explicitly
4295 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4296 implicitly initialized via a default constructor. ATTRIBUTES and
4297 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4299 The scope represented by the context of the returned DECL is pushed
4300 (if it is not the global namespace) and is assigned to
4301 *PUSHED_SCOPE_P. The caller is then responsible for calling
4302 pop_scope on *PUSHED_SCOPE_P if it is set. */
4305 start_decl (const cp_declarator *declarator,
4306 cp_decl_specifier_seq *declspecs,
4309 tree prefix_attributes,
4310 tree *pushed_scope_p)
4318 *pushed_scope_p = NULL_TREE;
4320 /* An object declared as __attribute__((deprecated)) suppresses
4321 warnings of uses of other deprecated items. */
4322 if (lookup_attribute ("deprecated", attributes))
4323 deprecated_state = DEPRECATED_SUPPRESS;
4325 attributes = chainon (attributes, prefix_attributes);
4327 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4330 deprecated_state = DEPRECATED_NORMAL;
4332 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4333 || decl == error_mark_node)
4334 return error_mark_node;
4336 context = CP_DECL_CONTEXT (decl);
4337 if (context != global_namespace)
4338 *pushed_scope_p = push_scope (context);
4341 /* Is it valid for this decl to have an initializer at all?
4342 If not, set INITIALIZED to zero, which will indirectly
4343 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4344 switch (TREE_CODE (decl))
4347 error ("typedef %qD is initialized (use decltype instead)", decl);
4348 return error_mark_node;
4351 if (initialized == SD_DELETED)
4352 /* We'll handle the rest of the semantics later, but we need to
4353 set this now so it's visible to duplicate_decls. */
4354 DECL_DELETED_FN (decl) = 1;
4363 if (! toplevel_bindings_p ()
4364 && DECL_EXTERNAL (decl))
4365 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4367 DECL_EXTERNAL (decl) = 0;
4368 if (toplevel_bindings_p ())
4369 TREE_STATIC (decl) = 1;
4371 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4373 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4374 record_key_method_defined (decl);
4376 /* If this is a typedef that names the class for linkage purposes
4377 (7.1.3p8), apply any attributes directly to the type. */
4378 if (TREE_CODE (decl) == TYPE_DECL
4379 && TAGGED_TYPE_P (TREE_TYPE (decl))
4380 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4381 flags = ATTR_FLAG_TYPE_IN_PLACE;
4385 /* Set attributes here so if duplicate decl, will have proper attributes. */
4386 cplus_decl_attributes (&decl, attributes, flags);
4388 /* Dllimported symbols cannot be defined. Static data members (which
4389 can be initialized in-class and dllimported) go through grokfield,
4390 not here, so we don't need to exclude those decls when checking for
4392 if (initialized && DECL_DLLIMPORT_P (decl))
4394 error ("definition of %q#D is marked %<dllimport%>", decl);
4395 DECL_DLLIMPORT_P (decl) = 0;
4398 /* If #pragma weak was used, mark the decl weak now. */
4399 maybe_apply_pragma_weak (decl);
4401 if (TREE_CODE (decl) == FUNCTION_DECL
4402 && DECL_DECLARED_INLINE_P (decl)
4403 && DECL_UNINLINABLE (decl)
4404 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4405 warning (0, "inline function %q+D given attribute noinline", decl);
4407 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4409 if (TREE_CODE (decl) == VAR_DECL)
4411 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4412 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4413 error ("%q#D is not a static member of %q#T", decl, context);
4416 if (DECL_CONTEXT (field) != context)
4418 if (!same_type_p (DECL_CONTEXT (field), context))
4419 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4420 "to be defined as %<%T::%D%>",
4421 DECL_CONTEXT (field), DECL_NAME (decl),
4422 context, DECL_NAME (decl));
4423 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4425 if (processing_specialization
4426 && template_class_depth (context) == 0
4427 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4428 error ("template header not allowed in member definition "
4429 "of explicitly specialized class");
4430 /* Static data member are tricky; an in-class initialization
4431 still doesn't provide a definition, so the in-class
4432 declaration will have DECL_EXTERNAL set, but will have an
4433 initialization. Thus, duplicate_decls won't warn
4434 about this situation, and so we check here. */
4435 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4436 error ("duplicate initialization of %qD", decl);
4437 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4439 if (declspecs->specs[(int) ds_constexpr]
4440 && !DECL_DECLARED_CONSTEXPR_P (field))
4441 error ("%qD declared %<constexpr%> outside its class", field);
4446 tree field = check_classfn (context, decl,
4447 (processing_template_decl
4448 > template_class_depth (context))
4449 ? current_template_parms
4451 if (field && field != error_mark_node
4452 && duplicate_decls (decl, field,
4453 /*newdecl_is_friend=*/false))
4457 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4458 DECL_IN_AGGR_P (decl) = 0;
4459 /* Do not mark DECL as an explicit specialization if it was not
4460 already marked as an instantiation; a declaration should
4461 never be marked as a specialization unless we know what
4462 template is being specialized. */
4463 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4465 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4467 /* [temp.expl.spec] An explicit specialization of a static data
4468 member of a template is a definition if the declaration
4469 includes an initializer; otherwise, it is a declaration.
4471 We check for processing_specialization so this only applies
4472 to the new specialization syntax. */
4473 if (!initialized && processing_specialization)
4474 DECL_EXTERNAL (decl) = 1;
4477 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4478 /* Aliases are definitions. */
4480 permerror (input_location, "declaration of %q#D outside of class is not definition",
4484 was_public = TREE_PUBLIC (decl);
4486 /* Enter this declaration into the symbol table. */
4487 decl = maybe_push_decl (decl);
4489 if (processing_template_decl)
4490 decl = push_template_decl (decl);
4491 if (decl == error_mark_node)
4492 return error_mark_node;
4494 /* Tell the back end to use or not use .common as appropriate. If we say
4495 -fconserve-space, we want this to save .data space, at the expense of
4496 wrong semantics. If we say -fno-conserve-space, we want this to
4497 produce errors about redefs; to do this we force variables into the
4499 if (flag_conserve_space
4500 && TREE_CODE (decl) == VAR_DECL
4501 && TREE_PUBLIC (decl)
4502 && !DECL_THREAD_LOCAL_P (decl)
4503 && !have_global_bss_p ())
4504 DECL_COMMON (decl) = 1;
4506 if (TREE_CODE (decl) == VAR_DECL
4507 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4508 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4510 /* This is a const variable with implicit 'static'. Set
4511 DECL_THIS_STATIC so we can tell it from variables that are
4512 !TREE_PUBLIC because of the anonymous namespace. */
4513 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4514 DECL_THIS_STATIC (decl) = 1;
4517 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4518 start_decl_1 (decl, initialized);
4523 /* Process the declaration of a variable DECL. INITIALIZED is true
4524 iff DECL is explicitly initialized. (INITIALIZED is false if the
4525 variable is initialized via an implicitly-called constructor.)
4526 This function must be called for ordinary variables (including, for
4527 example, implicit instantiations of templates), but must not be
4528 called for template declarations. */
4531 start_decl_1 (tree decl, bool initialized)
4535 bool aggregate_definition_p;
4537 gcc_assert (!processing_template_decl);
4539 if (error_operand_p (decl))
4542 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4544 type = TREE_TYPE (decl);
4545 complete_p = COMPLETE_TYPE_P (type);
4546 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4548 /* If an explicit initializer is present, or if this is a definition
4549 of an aggregate, then we need a complete type at this point.
4550 (Scalars are always complete types, so there is nothing to
4551 check.) This code just sets COMPLETE_P; errors (if necessary)
4552 are issued below. */
4553 if ((initialized || aggregate_definition_p)
4555 && COMPLETE_TYPE_P (complete_type (type)))
4558 /* We will not yet have set TREE_READONLY on DECL if the type
4559 was "const", but incomplete, before this point. But, now, we
4560 have a complete type, so we can try again. */
4561 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4565 /* Is it valid for this decl to have an initializer at all? */
4567 /* Don't allow initializations for incomplete types except for
4568 arrays which might be completed by the initialization. */
4570 ; /* A complete type is ok. */
4571 else if (type_uses_auto (type))
4572 ; /* An auto type is ok. */
4573 else if (TREE_CODE (type) != ARRAY_TYPE)
4575 error ("variable %q#D has initializer but incomplete type", decl);
4576 type = TREE_TYPE (decl) = error_mark_node;
4578 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4580 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4581 error ("elements of array %q#D have incomplete type", decl);
4582 /* else we already gave an error in start_decl. */
4585 else if (aggregate_definition_p && !complete_p)
4587 if (type_uses_auto (type))
4588 error ("declaration of %q#D has no initializer", decl);
4590 error ("aggregate %q#D has incomplete type and cannot be defined",
4592 /* Change the type so that assemble_variable will give
4593 DECL an rtl we can live with: (mem (const_int 0)). */
4594 type = TREE_TYPE (decl) = error_mark_node;
4597 /* Create a new scope to hold this declaration if necessary.
4598 Whether or not a new scope is necessary cannot be determined
4599 until after the type has been completed; if the type is a
4600 specialization of a class template it is not until after
4601 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4602 will be set correctly. */
4603 maybe_push_cleanup_level (type);
4606 /* Handle initialization of references. DECL, TYPE, and INIT have the
4607 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4608 but will be set to a new CLEANUP_STMT if a temporary is created
4609 that must be destroyed subsequently.
4611 Returns an initializer expression to use to initialize DECL, or
4612 NULL if the initialization can be performed statically.
4614 Quotes on semantics can be found in ARM 8.4.3. */
4617 grok_reference_init (tree decl, tree type, tree init, int flags)
4619 if (init == NULL_TREE)
4621 if ((DECL_LANG_SPECIFIC (decl) == 0
4622 || DECL_IN_AGGR_P (decl) == 0)
4623 && ! DECL_THIS_EXTERN (decl))
4624 error ("%qD declared as reference but not initialized", decl);
4628 if (TREE_CODE (init) == TREE_LIST)
4629 init = build_x_compound_expr_from_list (init, ELK_INIT,
4630 tf_warning_or_error);
4632 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4633 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4634 /* Note: default conversion is only called in very special cases. */
4635 init = decay_conversion (init);
4637 /* Convert INIT to the reference type TYPE. This may involve the
4638 creation of a temporary, whose lifetime must be the same as that
4639 of the reference. If so, a DECL_EXPR for the temporary will be
4640 added just after the DECL_EXPR for DECL. That's why we don't set
4641 DECL_INITIAL for local references (instead assigning to them
4642 explicitly); we need to allow the temporary to be initialized
4644 return initialize_reference (type, init, flags,
4645 tf_warning_or_error);
4648 /* Designated initializers in arrays are not supported in GNU C++.
4649 The parser cannot detect this error since it does not know whether
4650 a given brace-enclosed initializer is for a class type or for an
4651 array. This function checks that CE does not use a designated
4652 initializer. If it does, an error is issued. Returns true if CE
4653 is valid, i.e., does not have a designated initializer. */
4656 check_array_designated_initializer (const constructor_elt *ce,
4657 unsigned HOST_WIDE_INT index)
4659 /* Designated initializers for array elements are not supported. */
4662 /* The parser only allows identifiers as designated
4664 if (ce->index == error_mark_node)
4665 error ("name used in a GNU-style designated "
4666 "initializer for an array");
4667 else if (TREE_CODE (ce->index) == INTEGER_CST)
4669 /* A C99 designator is OK if it matches the current index. */
4670 if (TREE_INT_CST_LOW (ce->index) == index)
4673 sorry ("non-trivial designated initializers not supported");
4677 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4678 error ("name %qD used in a GNU-style designated "
4679 "initializer for an array", ce->index);
4687 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4688 array until we finish parsing the initializer. If that's the
4689 situation we're in, update DECL accordingly. */
4692 maybe_deduce_size_from_array_init (tree decl, tree init)
4694 tree type = TREE_TYPE (decl);
4696 if (TREE_CODE (type) == ARRAY_TYPE
4697 && TYPE_DOMAIN (type) == NULL_TREE
4698 && TREE_CODE (decl) != TYPE_DECL)
4700 /* do_default is really a C-ism to deal with tentative definitions.
4701 But let's leave it here to ease the eventual merge. */
4702 int do_default = !DECL_EXTERNAL (decl);
4703 tree initializer = init ? init : DECL_INITIAL (decl);
4706 /* Check that there are no designated initializers in INIT, as
4707 those are not supported in GNU C++, and as the middle-end
4708 will crash if presented with a non-numeric designated
4710 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4712 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4713 constructor_elt *ce;
4715 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4716 if (!check_array_designated_initializer (ce, i))
4722 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4726 error ("initializer fails to determine size of %qD", decl);
4727 TREE_TYPE (decl) = error_mark_node;
4729 else if (failure == 2)
4733 error ("array size missing in %qD", decl);
4734 TREE_TYPE (decl) = error_mark_node;
4736 /* If a `static' var's size isn't known, make it extern as
4737 well as static, so it does not get allocated. If it's not
4738 `static', then don't mark it extern; finish_incomplete_decl
4739 will give it a default size and it will get allocated. */
4740 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4741 DECL_EXTERNAL (decl) = 1;
4743 else if (failure == 3)
4745 error ("zero-size array %qD", decl);
4746 TREE_TYPE (decl) = error_mark_node;
4750 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4752 relayout_decl (decl);
4756 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4757 any appropriate error messages regarding the layout. */
4760 layout_var_decl (tree decl)
4764 type = TREE_TYPE (decl);
4765 if (type == error_mark_node)
4768 /* If we haven't already layed out this declaration, do so now.
4769 Note that we must not call complete type for an external object
4770 because it's type might involve templates that we are not
4771 supposed to instantiate yet. (And it's perfectly valid to say
4772 `extern X x' for some incomplete type `X'.) */
4773 if (!DECL_EXTERNAL (decl))
4774 complete_type (type);
4775 if (!DECL_SIZE (decl)
4776 && TREE_TYPE (decl) != error_mark_node
4777 && (COMPLETE_TYPE_P (type)
4778 || (TREE_CODE (type) == ARRAY_TYPE
4779 && !TYPE_DOMAIN (type)
4780 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4781 layout_decl (decl, 0);
4783 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4785 /* An automatic variable with an incomplete type: that is an error.
4786 Don't talk about array types here, since we took care of that
4787 message in grokdeclarator. */
4788 error ("storage size of %qD isn%'t known", decl);
4789 TREE_TYPE (decl) = error_mark_node;
4792 /* Keep this code around in case we later want to control debug info
4793 based on whether a type is "used". (jason 1999-11-11) */
4795 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4796 /* Let debugger know it should output info for this type. */
4797 note_debug_info_needed (ttype);
4799 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4800 note_debug_info_needed (DECL_CONTEXT (decl));
4803 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4804 && DECL_SIZE (decl) != NULL_TREE
4805 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4807 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4808 constant_expression_warning (DECL_SIZE (decl));
4811 error ("storage size of %qD isn%'t constant", decl);
4812 TREE_TYPE (decl) = error_mark_node;
4817 /* If a local static variable is declared in an inline function, or if
4818 we have a weak definition, we must endeavor to create only one
4819 instance of the variable at link-time. */
4822 maybe_commonize_var (tree decl)
4824 /* Static data in a function with comdat linkage also has comdat
4826 if (TREE_STATIC (decl)
4827 /* Don't mess with __FUNCTION__. */
4828 && ! DECL_ARTIFICIAL (decl)
4829 && DECL_FUNCTION_SCOPE_P (decl)
4830 && vague_linkage_p (DECL_CONTEXT (decl)))
4834 /* With weak symbols, we simply make the variable COMDAT;
4835 that will cause copies in multiple translations units to
4837 comdat_linkage (decl);
4841 if (DECL_INITIAL (decl) == NULL_TREE
4842 || DECL_INITIAL (decl) == error_mark_node)
4844 /* Without weak symbols, we can use COMMON to merge
4845 uninitialized variables. */
4846 TREE_PUBLIC (decl) = 1;
4847 DECL_COMMON (decl) = 1;
4851 /* While for initialized variables, we must use internal
4852 linkage -- which means that multiple copies will not
4854 TREE_PUBLIC (decl) = 0;
4855 DECL_COMMON (decl) = 0;
4856 warning_at (input_location, 0,
4857 "sorry: semantics of inline function static "
4858 "data %q+#D are wrong (you%'ll wind up "
4859 "with multiple copies)", decl);
4860 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4861 " you can work around this by removing "
4866 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4867 /* Set it up again; we might have set DECL_INITIAL since the last
4869 comdat_linkage (decl);
4872 /* Issue an error message if DECL is an uninitialized const variable. */
4875 check_for_uninitialized_const_var (tree decl)
4877 tree type = strip_array_types (TREE_TYPE (decl));
4879 /* ``Unless explicitly declared extern, a const object does not have
4880 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4882 if (TREE_CODE (decl) == VAR_DECL
4883 && TREE_CODE (type) != REFERENCE_TYPE
4884 && CP_TYPE_CONST_P (type)
4885 && !DECL_INITIAL (decl))
4887 tree field = default_init_uninitialized_part (type);
4891 permerror (DECL_SOURCE_LOCATION (decl),
4892 "uninitialized const %qD", decl);
4894 if (CLASS_TYPE_P (type))
4896 tree defaulted_ctor;
4898 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4899 "%q#T has no user-provided default constructor", type);
4900 defaulted_ctor = in_class_defaulted_default_constructor (type);
4902 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4903 "constructor is not user-provided because it is "
4904 "explicitly defaulted in the class body");
4905 inform (0, "and the implicitly-defined constructor does not "
4906 "initialize %q+#D", field);
4911 /* Structure holding the current initializer being processed by reshape_init.
4912 CUR is a pointer to the current element being processed, END is a pointer
4913 after the last element present in the initializer. */
4914 typedef struct reshape_iterator_t
4916 constructor_elt *cur;
4917 constructor_elt *end;
4920 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4922 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4923 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4924 initialized. If there are no more such fields, the return value
4928 next_initializable_field (tree field)
4931 && (TREE_CODE (field) != FIELD_DECL
4932 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4933 || DECL_ARTIFICIAL (field)))
4934 field = DECL_CHAIN (field);
4939 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4940 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4941 INTEGER_CST representing the size of the array minus one (the maximum index),
4942 or NULL_TREE if the array was declared without specifying the size. D is
4943 the iterator within the constructor. */
4946 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4947 tsubst_flags_t complain)
4950 bool sized_array_p = (max_index != NULL_TREE);
4951 unsigned HOST_WIDE_INT max_index_cst = 0;
4952 unsigned HOST_WIDE_INT index;
4954 /* The initializer for an array is always a CONSTRUCTOR. */
4955 new_init = build_constructor (init_list_type_node, NULL);
4959 /* Minus 1 is used for zero sized arrays. */
4960 if (integer_all_onesp (max_index))
4963 if (host_integerp (max_index, 1))
4964 max_index_cst = tree_low_cst (max_index, 1);
4965 /* sizetype is sign extended, not zero extended. */
4967 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4971 /* Loop until there are no more initializers. */
4973 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4978 check_array_designated_initializer (d->cur, index);
4979 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
4981 if (elt_init == error_mark_node)
4982 return error_mark_node;
4983 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
4984 size_int (index), elt_init);
4985 if (!TREE_CONSTANT (elt_init))
4986 TREE_CONSTANT (new_init) = false;
4992 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4993 Parameters are the same of reshape_init_r. */
4996 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
4998 tree max_index = NULL_TREE;
5000 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5002 if (TYPE_DOMAIN (type))
5003 max_index = array_type_nelts (type);
5005 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5008 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5009 Parameters are the same of reshape_init_r. */
5012 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5014 tree max_index = NULL_TREE;
5016 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5018 if (COMPOUND_LITERAL_P (d->cur->value))
5020 tree value = d->cur->value;
5021 if (!same_type_p (TREE_TYPE (value), type))
5023 if (complain & tf_error)
5024 error ("invalid type %qT as initializer for a vector of type %qT",
5025 TREE_TYPE (d->cur->value), type);
5026 value = error_mark_node;
5032 /* For a vector, we initialize it as an array of the appropriate size. */
5033 if (TREE_CODE (type) == VECTOR_TYPE)
5034 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5036 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5039 /* Subroutine of reshape_init_r, processes the initializers for classes
5040 or union. Parameters are the same of reshape_init_r. */
5043 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5044 tsubst_flags_t complain)
5049 gcc_assert (CLASS_TYPE_P (type));
5051 /* The initializer for a class is always a CONSTRUCTOR. */
5052 new_init = build_constructor (init_list_type_node, NULL);
5053 field = next_initializable_field (TYPE_FIELDS (type));
5059 An initializer for an aggregate member that is an
5060 empty class shall have the form of an empty
5061 initializer-list {}. */
5062 if (!first_initializer_p)
5064 if (complain & tf_error)
5065 error ("initializer for %qT must be brace-enclosed", type);
5066 return error_mark_node;
5071 /* Loop through the initializable fields, gathering initializers. */
5072 while (d->cur != d->end)
5076 /* Handle designated initializers, as an extension. */
5079 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5081 if (!field || TREE_CODE (field) != FIELD_DECL)
5083 if (complain & tf_error)
5084 error ("%qT has no non-static data member named %qD", type,
5086 return error_mark_node;
5090 /* If we processed all the member of the class, we are done. */
5094 field_init = reshape_init_r (TREE_TYPE (field), d,
5095 /*first_initializer_p=*/false, complain);
5096 if (field_init == error_mark_node)
5097 return error_mark_node;
5099 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5103 When a union is initialized with a brace-enclosed
5104 initializer, the braces shall only contain an
5105 initializer for the first member of the union. */
5106 if (TREE_CODE (type) == UNION_TYPE)
5109 field = next_initializable_field (DECL_CHAIN (field));
5115 /* Subroutine of reshape_init, which processes a single initializer (part of
5116 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5117 iterator within the CONSTRUCTOR which points to the initializer to process.
5118 FIRST_INITIALIZER_P is true if this is the first initializer of the
5119 outermost CONSTRUCTOR node. */
5122 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5123 tsubst_flags_t complain)
5125 tree init = d->cur->value;
5127 if (error_operand_p (init))
5128 return error_mark_node;
5130 if (TREE_CODE (type) == COMPLEX_TYPE)
5132 /* A complex type can be initialized from one or two initializers,
5133 but braces are not elided. */
5135 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5137 if (CONSTRUCTOR_NELTS (init) > 2)
5139 if (complain & tf_error)
5140 error ("too many initializers for %qT", type);
5142 return error_mark_node;
5145 else if (first_initializer_p && d->cur != d->end)
5147 VEC(constructor_elt, gc) *v = 0;
5148 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5149 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5151 init = build_constructor (init_list_type_node, v);
5156 /* A non-aggregate type is always initialized with a single
5158 if (!CP_AGGREGATE_TYPE_P (type))
5160 /* It is invalid to initialize a non-aggregate type with a
5161 brace-enclosed initializer before C++0x.
5162 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5163 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5164 a CONSTRUCTOR (with a record type). */
5165 if (TREE_CODE (init) == CONSTRUCTOR
5166 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5168 if (SCALAR_TYPE_P (type))
5170 if (complain & tf_error)
5171 error ("braces around scalar initializer for type %qT", type);
5172 init = error_mark_node;
5175 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5184 All implicit type conversions (clause _conv_) are considered when
5185 initializing the aggregate member with an initializer from an
5186 initializer-list. If the initializer can initialize a member,
5187 the member is initialized. Otherwise, if the member is itself a
5188 non-empty subaggregate, brace elision is assumed and the
5189 initializer is considered for the initialization of the first
5190 member of the subaggregate. */
5191 if (TREE_CODE (init) != CONSTRUCTOR
5192 /* But don't try this for the first initializer, since that would be
5193 looking through the outermost braces; A a2 = { a1 }; is not a
5194 valid aggregate initialization. */
5195 && !first_initializer_p
5196 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5197 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5203 /* [dcl.init.string]
5205 A char array (whether plain char, signed char, or unsigned char)
5206 can be initialized by a string-literal (optionally enclosed in
5207 braces); a wchar_t array can be initialized by a wide
5208 string-literal (optionally enclosed in braces). */
5209 if (TREE_CODE (type) == ARRAY_TYPE
5210 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5212 tree str_init = init;
5214 /* Strip one level of braces if and only if they enclose a single
5215 element (as allowed by [dcl.init.string]). */
5216 if (!first_initializer_p
5217 && TREE_CODE (str_init) == CONSTRUCTOR
5218 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5220 str_init = VEC_index (constructor_elt,
5221 CONSTRUCTOR_ELTS (str_init), 0)->value;
5224 /* If it's a string literal, then it's the initializer for the array
5225 as a whole. Otherwise, continue with normal initialization for
5226 array types (one value per array element). */
5227 if (TREE_CODE (str_init) == STRING_CST)
5234 /* The following cases are about aggregates. If we are not within a full
5235 initializer already, and there is not a CONSTRUCTOR, it means that there
5236 is a missing set of braces (that is, we are processing the case for
5237 which reshape_init exists). */
5238 if (!first_initializer_p)
5240 if (TREE_CODE (init) == CONSTRUCTOR)
5242 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5243 /* There is no need to reshape pointer-to-member function
5244 initializers, as they are always constructed correctly
5245 by the front end. */
5247 else if (COMPOUND_LITERAL_P (init))
5248 /* For a nested compound literal, there is no need to reshape since
5249 brace elision is not allowed. Even if we decided to allow it,
5250 we should add a call to reshape_init in finish_compound_literal,
5251 before calling digest_init, so changing this code would still
5252 not be necessary. */
5253 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5257 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5258 return reshape_init (type, init, complain);
5262 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5266 /* Dispatch to specialized routines. */
5267 if (CLASS_TYPE_P (type))
5268 return reshape_init_class (type, d, first_initializer_p, complain);
5269 else if (TREE_CODE (type) == ARRAY_TYPE)
5270 return reshape_init_array (type, d, complain);
5271 else if (TREE_CODE (type) == VECTOR_TYPE)
5272 return reshape_init_vector (type, d, complain);
5277 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5278 brace-enclosed aggregate initializer.
5280 INIT is the CONSTRUCTOR containing the list of initializers describing
5281 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5282 It may not presently match the shape of the TYPE; for example:
5284 struct S { int a; int b; };
5285 struct S a[] = { 1, 2, 3, 4 };
5287 Here INIT will hold a VEC of four elements, rather than a
5288 VEC of two elements, each itself a VEC of two elements. This
5289 routine transforms INIT from the former form into the latter. The
5290 revised CONSTRUCTOR node is returned. */
5293 reshape_init (tree type, tree init, tsubst_flags_t complain)
5295 VEC(constructor_elt, gc) *v;
5299 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5301 v = CONSTRUCTOR_ELTS (init);
5303 /* An empty constructor does not need reshaping, and it is always a valid
5305 if (VEC_empty (constructor_elt, v))
5308 /* Recurse on this CONSTRUCTOR. */
5309 d.cur = VEC_index (constructor_elt, v, 0);
5310 d.end = d.cur + VEC_length (constructor_elt, v);
5312 new_init = reshape_init_r (type, &d, true, complain);
5313 if (new_init == error_mark_node)
5314 return error_mark_node;
5316 /* Make sure all the element of the constructor were used. Otherwise,
5317 issue an error about exceeding initializers. */
5320 if (complain & tf_error)
5321 error ("too many initializers for %qT", type);
5323 return error_mark_node;
5329 /* Verify array initializer. Returns true if errors have been reported. */
5332 check_array_initializer (tree decl, tree type, tree init)
5334 tree element_type = TREE_TYPE (type);
5336 /* The array type itself need not be complete, because the
5337 initializer may tell us how many elements are in the array.
5338 But, the elements of the array must be complete. */
5339 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5342 error ("elements of array %q#D have incomplete type", decl);
5344 error ("elements of array %q#T have incomplete type", type);
5347 /* It is not valid to initialize a VLA. */
5349 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5350 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5353 error ("variable-sized object %qD may not be initialized", decl);
5355 error ("variable-sized compound literal");
5361 /* Subroutine of check_initializer; args are passed down from that function.
5362 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5365 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5368 int saved_stmts_are_full_exprs_p = 0;
5369 if (building_stmt_list_p ())
5371 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5372 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5374 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5375 if (building_stmt_list_p ())
5376 current_stmt_tree ()->stmts_are_full_exprs_p =
5377 saved_stmts_are_full_exprs_p;
5381 /* Verify INIT (the initializer for DECL), and record the
5382 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5383 grok_reference_init.
5385 If the return value is non-NULL, it is an expression that must be
5386 evaluated dynamically to initialize DECL. */
5389 check_initializer (tree decl, tree init, int flags, VEC(tree,gc) **cleanups)
5391 tree type = TREE_TYPE (decl);
5392 tree init_code = NULL;
5393 tree extra_init = NULL_TREE;
5396 /* Things that are going to be initialized need to have complete
5398 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5400 if (DECL_HAS_VALUE_EXPR_P (decl))
5402 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5403 it doesn't have storage to be initialized. */
5404 gcc_assert (init == NULL_TREE);
5408 if (type == error_mark_node)
5409 /* We will have already complained. */
5412 if (TREE_CODE (type) == ARRAY_TYPE)
5414 if (check_array_initializer (decl, type, init))
5417 else if (!COMPLETE_TYPE_P (type))
5419 error ("%qD has incomplete type", decl);
5420 TREE_TYPE (decl) = error_mark_node;
5424 /* There is no way to make a variable-sized class type in GNU C++. */
5425 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5427 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5429 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5430 if (SCALAR_TYPE_P (type))
5434 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5435 init = build_zero_init (type, NULL_TREE, false);
5437 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5439 error ("scalar object %qD requires one element in initializer",
5441 TREE_TYPE (decl) = error_mark_node;
5447 if (TREE_CODE (decl) == CONST_DECL)
5449 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5451 DECL_INITIAL (decl) = init;
5453 gcc_assert (init != NULL_TREE);
5456 else if (!init && DECL_REALLY_EXTERN (decl))
5458 else if (init || type_build_ctor_call (type)
5459 || TREE_CODE (type) == REFERENCE_TYPE)
5461 if (TREE_CODE (type) == REFERENCE_TYPE)
5463 init = grok_reference_init (decl, type, init, flags);
5464 flags |= LOOKUP_ALREADY_DIGESTED;
5467 check_for_uninitialized_const_var (decl);
5468 /* Do not reshape constructors of vectors (they don't need to be
5470 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5472 if (is_std_init_list (type))
5474 init = perform_implicit_conversion (type, init,
5475 tf_warning_or_error);
5476 flags |= LOOKUP_ALREADY_DIGESTED;
5478 else if (TYPE_NON_AGGREGATE_CLASS (type))
5480 /* Don't reshape if the class has constructors. */
5481 if (cxx_dialect == cxx98)
5482 error ("in C++98 %qD must be initialized by constructor, "
5486 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5488 error ("opaque vector types cannot be initialized");
5489 init = error_mark_node;
5493 init = reshape_init (type, init, tf_warning_or_error);
5494 if (SCALAR_TYPE_P (type))
5495 check_narrowing (type, init);
5499 /* If DECL has an array type without a specific bound, deduce the
5500 array size from the initializer. */
5501 maybe_deduce_size_from_array_init (decl, init);
5502 type = TREE_TYPE (decl);
5503 if (type == error_mark_node)
5506 if ((type_build_ctor_call (type) || CLASS_TYPE_P (type))
5507 && !(flags & LOOKUP_ALREADY_DIGESTED)
5508 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
5509 && CP_AGGREGATE_TYPE_P (type)))
5511 init_code = build_aggr_init_full_exprs (decl, init, flags);
5513 /* If this is a constexpr initializer, expand_default_init will
5514 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5515 case, pull the initializer back out and pass it down into
5516 store_init_value. */
5517 while (TREE_CODE (init_code) == EXPR_STMT
5518 || TREE_CODE (init_code) == CONVERT_EXPR)
5519 init_code = TREE_OPERAND (init_code, 0);
5520 if (TREE_CODE (init_code) == INIT_EXPR)
5522 init = TREE_OPERAND (init_code, 1);
5523 init_code = NULL_TREE;
5524 /* Don't call digest_init; it's unnecessary and will complain
5525 about aggregate initialization of non-aggregate classes. */
5526 flags |= LOOKUP_ALREADY_DIGESTED;
5528 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5530 /* Declared constexpr, but no suitable initializer; massage
5531 init appropriately so we can pass it into store_init_value
5533 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5534 init = finish_compound_literal (type, init,
5535 tf_warning_or_error);
5536 else if (CLASS_TYPE_P (type)
5537 && (!init || TREE_CODE (init) == TREE_LIST))
5539 init = build_functional_cast (type, init, tf_none);
5540 if (init != error_mark_node)
5541 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5543 init_code = NULL_TREE;
5549 if (init && TREE_CODE (init) != TREE_VEC)
5551 init_code = store_init_value (decl, init, cleanups, flags);
5552 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5553 && DECL_INITIAL (decl)
5554 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5555 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5556 warning (0, "array %qD initialized by parenthesized string literal %qE",
5557 decl, DECL_INITIAL (decl));
5563 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5564 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5565 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5566 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5569 check_for_uninitialized_const_var (decl);
5572 if (init && init != error_mark_node)
5573 init_code = build2 (INIT_EXPR, type, decl, init);
5576 init_code = add_stmt_to_compound (extra_init, init_code);
5578 if (init_code && DECL_IN_AGGR_P (decl))
5580 static int explained = 0;
5582 if (cxx_dialect < cxx0x)
5583 error ("initializer invalid for static member with constructor");
5585 error ("non-constant in-class initialization invalid for static "
5586 "member %qD", decl);
5589 error ("(an out of class initialization is required)");
5597 /* If DECL is not a local variable, give it RTL. */
5600 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5602 int toplev = toplevel_bindings_p ();
5604 const char *filename;
5606 /* Set the DECL_ASSEMBLER_NAME for the object. */
5609 /* The `register' keyword, when used together with an
5610 asm-specification, indicates that the variable should be
5611 placed in a particular register. */
5612 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5614 set_user_assembler_name (decl, asmspec);
5615 DECL_HARD_REGISTER (decl) = 1;
5619 if (TREE_CODE (decl) == FUNCTION_DECL
5620 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5621 set_builtin_user_assembler_name (decl, asmspec);
5622 set_user_assembler_name (decl, asmspec);
5626 /* Handle non-variables up front. */
5627 if (TREE_CODE (decl) != VAR_DECL)
5629 rest_of_decl_compilation (decl, toplev, at_eof);
5633 /* If we see a class member here, it should be a static data
5635 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5637 gcc_assert (TREE_STATIC (decl));
5638 /* An in-class declaration of a static data member should be
5639 external; it is only a declaration, and not a definition. */
5640 if (init == NULL_TREE)
5641 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5644 /* We don't create any RTL for local variables. */
5645 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5648 /* We defer emission of local statics until the corresponding
5649 DECL_EXPR is expanded. */
5650 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5652 /* We try to defer namespace-scope static constants so that they are
5653 not emitted into the object file unnecessarily. */
5654 filename = input_filename;
5655 if (!DECL_VIRTUAL_P (decl)
5656 && TREE_READONLY (decl)
5657 && DECL_INITIAL (decl) != NULL_TREE
5658 && DECL_INITIAL (decl) != error_mark_node
5660 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5662 && !TREE_PUBLIC (decl))
5664 /* Fool with the linkage of static consts according to #pragma
5666 struct c_fileinfo *finfo = get_fileinfo (filename);
5667 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5669 TREE_PUBLIC (decl) = 1;
5670 DECL_EXTERNAL (decl) = finfo->interface_only;
5675 /* Likewise for template instantiations. */
5676 else if (DECL_LANG_SPECIFIC (decl)
5677 && DECL_IMPLICIT_INSTANTIATION (decl))
5680 /* If we're not deferring, go ahead and assemble the variable. */
5682 rest_of_decl_compilation (decl, toplev, at_eof);
5685 /* walk_tree helper for wrap_temporary_cleanups, below. */
5688 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5690 /* Stop at types or full-expression boundaries. */
5691 if (TYPE_P (*stmt_p)
5692 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
5698 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5700 tree guard = (tree)data;
5701 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5703 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5704 /* Tell honor_protect_cleanup_actions to handle this as a separate
5706 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5708 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5714 /* We're initializing a local variable which has a cleanup GUARD. If there
5715 are any temporaries used in the initializer INIT of this variable, we
5716 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5717 variable will be cleaned up properly if one of them throws.
5719 Unfortunately, there's no way to express this properly in terms of
5720 nesting, as the regions for the temporaries overlap the region for the
5721 variable itself; if there are two temporaries, the variable needs to be
5722 the first thing destroyed if either of them throws. However, we only
5723 want to run the variable's cleanup if it actually got constructed. So
5724 we need to guard the temporary cleanups with the variable's cleanup if
5725 they are run on the normal path, but not if they are run on the
5726 exceptional path. We implement this by telling
5727 honor_protect_cleanup_actions to strip the variable cleanup from the
5728 exceptional path. */
5731 wrap_temporary_cleanups (tree init, tree guard)
5733 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5736 /* Generate code to initialize DECL (a local variable). */
5739 initialize_local_var (tree decl, tree init)
5741 tree type = TREE_TYPE (decl);
5745 gcc_assert (TREE_CODE (decl) == VAR_DECL
5746 || TREE_CODE (decl) == RESULT_DECL);
5747 gcc_assert (!TREE_STATIC (decl));
5749 if (DECL_SIZE (decl) == NULL_TREE)
5751 /* If we used it already as memory, it must stay in memory. */
5752 DECL_INITIAL (decl) = NULL_TREE;
5753 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5757 if (type == error_mark_node)
5760 /* Compute and store the initial value. */
5761 already_used = TREE_USED (decl) || TREE_USED (type);
5762 if (TREE_USED (type))
5763 DECL_READ_P (decl) = 1;
5765 /* Generate a cleanup, if necessary. */
5766 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5768 /* Perform the initialization. */
5771 if (TREE_CODE (init) == INIT_EXPR
5772 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5774 /* Stick simple initializers in DECL_INITIAL so that
5775 -Wno-init-self works (c++/34772). */
5776 gcc_assert (TREE_OPERAND (init, 0) == decl);
5777 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5781 int saved_stmts_are_full_exprs_p;
5783 /* If we're only initializing a single object, guard the
5784 destructors of any temporaries used in its initializer with
5785 its destructor. This isn't right for arrays because each
5786 element initialization is a full-expression. */
5787 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5788 wrap_temporary_cleanups (init, cleanup);
5790 gcc_assert (building_stmt_list_p ());
5791 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5792 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5793 finish_expr_stmt (init);
5794 current_stmt_tree ()->stmts_are_full_exprs_p =
5795 saved_stmts_are_full_exprs_p;
5799 /* Set this to 0 so we can tell whether an aggregate which was
5800 initialized was ever used. Don't do this if it has a
5801 destructor, so we don't complain about the 'resource
5802 allocation is initialization' idiom. Now set
5803 attribute((unused)) on types so decls of that type will be
5804 marked used. (see TREE_USED, above.) */
5805 if (TYPE_NEEDS_CONSTRUCTING (type)
5807 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5808 && DECL_NAME (decl))
5809 TREE_USED (decl) = 0;
5810 else if (already_used)
5811 TREE_USED (decl) = 1;
5814 finish_decl_cleanup (decl, cleanup);
5817 /* DECL is a VAR_DECL for a compiler-generated variable with static
5818 storage duration (like a virtual table) whose initializer is a
5819 compile-time constant. Initialize the variable and provide it to the
5823 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5826 gcc_assert (DECL_ARTIFICIAL (decl));
5827 init = build_constructor (TREE_TYPE (decl), v);
5828 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5829 DECL_INITIAL (decl) = init;
5830 DECL_INITIALIZED_P (decl) = 1;
5831 determine_visibility (decl);
5832 layout_var_decl (decl);
5833 maybe_commonize_var (decl);
5834 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5837 /* INIT is the initializer for a variable, as represented by the
5838 parser. Returns true iff INIT is type-dependent. */
5841 type_dependent_init_p (tree init)
5843 if (TREE_CODE (init) == TREE_LIST)
5844 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5845 return any_type_dependent_elements_p (init);
5846 else if (TREE_CODE (init) == CONSTRUCTOR)
5847 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5849 VEC(constructor_elt, gc) *elts;
5853 elts = CONSTRUCTOR_ELTS (init);
5854 nelts = VEC_length (constructor_elt, elts);
5855 for (i = 0; i < nelts; ++i)
5856 if (type_dependent_init_p (VEC_index (constructor_elt,
5861 /* It must be a simple expression, e.g., int i = 3; */
5862 return type_dependent_expression_p (init);
5867 /* INIT is the initializer for a variable, as represented by the
5868 parser. Returns true iff INIT is value-dependent. */
5871 value_dependent_init_p (tree init)
5873 if (TREE_CODE (init) == TREE_LIST)
5874 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5875 return any_value_dependent_elements_p (init);
5876 else if (TREE_CODE (init) == CONSTRUCTOR)
5877 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5879 VEC(constructor_elt, gc) *elts;
5883 elts = CONSTRUCTOR_ELTS (init);
5884 nelts = VEC_length (constructor_elt, elts);
5885 for (i = 0; i < nelts; ++i)
5886 if (value_dependent_init_p (VEC_index (constructor_elt,
5891 /* It must be a simple expression, e.g., int i = 3; */
5892 return value_dependent_expression_p (init);
5897 /* Finish processing of a declaration;
5898 install its line number and initial value.
5899 If the length of an array type is not known before,
5900 it must be determined now, from the initial value, or it is an error.
5902 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5903 true, then INIT is an integral constant expression.
5905 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5906 if the (init) syntax was used. */
5909 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5910 tree asmspec_tree, int flags)
5913 VEC(tree,gc) *cleanups = NULL;
5914 const char *asmspec = NULL;
5915 int was_readonly = 0;
5916 bool var_definition_p = false;
5919 if (decl == error_mark_node)
5924 error ("assignment (not initialization) in declaration");
5928 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5929 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5930 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5932 type = TREE_TYPE (decl);
5933 if (type == error_mark_node)
5936 /* If a name was specified, get the string. */
5937 if (at_namespace_scope_p ())
5938 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5939 if (asmspec_tree && asmspec_tree != error_mark_node)
5940 asmspec = TREE_STRING_POINTER (asmspec_tree);
5942 if (current_class_type
5943 && CP_DECL_CONTEXT (decl) == current_class_type
5944 && TYPE_BEING_DEFINED (current_class_type)
5945 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5946 && (DECL_INITIAL (decl) || init))
5947 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5949 auto_node = type_uses_auto (type);
5953 if (init == NULL_TREE)
5955 error ("declaration of %q#D has no initializer", decl);
5956 TREE_TYPE (decl) = error_mark_node;
5960 if (TREE_CODE (d_init) == TREE_LIST)
5961 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5962 tf_warning_or_error);
5963 d_init = resolve_nondeduced_context (d_init);
5964 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5966 if (type == error_mark_node)
5970 if (!ensure_literal_type_for_constexpr_object (decl))
5971 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5973 if (TREE_CODE (decl) == VAR_DECL
5974 && DECL_CLASS_SCOPE_P (decl)
5975 && DECL_INITIALIZED_IN_CLASS_P (decl))
5976 check_static_variable_definition (decl, type);
5978 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5981 if (init == ridpointers[(int)RID_DELETE])
5983 /* FIXME check this is 1st decl. */
5984 DECL_DELETED_FN (decl) = 1;
5985 DECL_DECLARED_INLINE_P (decl) = 1;
5986 DECL_INITIAL (decl) = error_mark_node;
5987 FOR_EACH_CLONE (clone, decl)
5989 DECL_DELETED_FN (clone) = 1;
5990 DECL_DECLARED_INLINE_P (clone) = 1;
5991 DECL_INITIAL (clone) = error_mark_node;
5995 else if (init == ridpointers[(int)RID_DEFAULT])
5997 if (defaultable_fn_check (decl))
5998 DECL_DEFAULTED_FN (decl) = 1;
6000 DECL_INITIAL (decl) = NULL_TREE;
6004 if (init && TREE_CODE (decl) == VAR_DECL)
6006 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6007 /* If DECL is a reference, then we want to know whether init is a
6008 reference constant; init_const_expr_p as passed tells us whether
6009 it's an rvalue constant. */
6010 if (TREE_CODE (type) == REFERENCE_TYPE)
6011 init_const_expr_p = potential_constant_expression (init);
6012 if (init_const_expr_p)
6014 /* Set these flags now for templates. We'll update the flags in
6015 store_init_value for instantiations. */
6016 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6017 if (decl_maybe_constant_var_p (decl))
6018 TREE_CONSTANT (decl) = 1;
6022 if (processing_template_decl)
6024 bool type_dependent_p;
6026 /* Add this declaration to the statement-tree. */
6027 if (at_function_scope_p ())
6028 add_decl_expr (decl);
6030 type_dependent_p = dependent_type_p (type);
6032 if (check_for_bare_parameter_packs (init))
6035 DECL_INITIAL (decl) = NULL_TREE;
6038 /* Generally, initializers in templates are expanded when the
6039 template is instantiated. But, if DECL is a variable constant
6040 then it can be used in future constant expressions, so its value
6041 must be available. */
6043 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6044 /* We can't do anything if the decl has dependent type. */;
6046 && init_const_expr_p
6047 && !type_dependent_p
6048 && decl_maybe_constant_var_p (decl)
6049 && !type_dependent_init_p (init)
6050 && !value_dependent_init_p (init))
6052 /* This variable seems to be a non-dependent constant, so process
6053 its initializer. If check_initializer returns non-null the
6054 initialization wasn't constant after all. */
6056 cleanups = make_tree_vector ();
6057 init_code = check_initializer (decl, init, flags, &cleanups);
6058 if (init_code == NULL_TREE)
6060 release_tree_vector (cleanups);
6062 else if (!DECL_PRETTY_FUNCTION_P (decl))
6063 /* Deduce array size even if the initializer is dependent. */
6064 maybe_deduce_size_from_array_init (decl, init);
6067 DECL_INITIAL (decl) = init;
6071 /* Just store non-static data member initializers for later. */
6072 if (init && TREE_CODE (decl) == FIELD_DECL)
6073 DECL_INITIAL (decl) = init;
6075 /* Take care of TYPE_DECLs up front. */
6076 if (TREE_CODE (decl) == TYPE_DECL)
6078 if (type != error_mark_node
6079 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6081 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6082 warning (0, "shadowing previous type declaration of %q#D", decl);
6083 set_identifier_type_value (DECL_NAME (decl), decl);
6086 /* If we have installed this as the canonical typedef for this
6087 type, and that type has not been defined yet, delay emitting
6088 the debug information for it, as we will emit it later. */
6089 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6090 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6091 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6093 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6098 /* A reference will be modified here, as it is initialized. */
6099 if (! DECL_EXTERNAL (decl)
6100 && TREE_READONLY (decl)
6101 && TREE_CODE (type) == REFERENCE_TYPE)
6104 TREE_READONLY (decl) = 0;
6107 if (TREE_CODE (decl) == VAR_DECL)
6109 /* Only variables with trivial initialization and destruction can
6110 have thread-local storage. */
6111 if (DECL_THREAD_LOCAL_P (decl)
6112 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6113 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6114 error ("%qD cannot be thread-local because it has non-trivial "
6115 "type %qT", decl, TREE_TYPE (decl));
6116 /* If this is a local variable that will need a mangled name,
6117 register it now. We must do this before processing the
6118 initializer for the variable, since the initialization might
6119 require a guard variable, and since the mangled name of the
6120 guard variable will depend on the mangled name of this
6122 if (DECL_FUNCTION_SCOPE_P (decl)
6123 && TREE_STATIC (decl)
6124 && !DECL_ARTIFICIAL (decl))
6126 push_local_name (decl);
6127 if (DECL_CONSTRUCTOR_P (current_function_decl)
6128 || DECL_DESTRUCTOR_P (current_function_decl))
6129 /* Normally local_decls is populated during GIMPLE lowering,
6130 but [cd]tors are never actually compiled directly. We need
6131 to put statics on the list so we can deal with the label
6132 address extension. */
6133 add_local_decl (cfun, decl);
6136 /* Convert the initializer to the type of DECL, if we have not
6137 already initialized DECL. */
6138 if (!DECL_INITIALIZED_P (decl)
6139 /* If !DECL_EXTERNAL then DECL is being defined. In the
6140 case of a static data member initialized inside the
6141 class-specifier, there can be an initializer even if DECL
6142 is *not* defined. */
6143 && (!DECL_EXTERNAL (decl) || init))
6145 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6148 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6149 /* Allow libjava/prims.cc define primitive classes. */
6150 if (init != NULL_TREE
6151 || jclass == NULL_TREE
6152 || TREE_CODE (jclass) != TYPE_DECL
6153 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6154 || !same_type_ignoring_top_level_qualifiers_p
6155 (type, TREE_TYPE (TREE_TYPE (jclass))))
6156 error ("Java object %qD not allocated with %<new%>", decl);
6159 cleanups = make_tree_vector ();
6160 init = check_initializer (decl, init, flags, &cleanups);
6161 /* Thread-local storage cannot be dynamically initialized. */
6162 if (DECL_THREAD_LOCAL_P (decl) && init)
6164 error ("%qD is thread-local and so cannot be dynamically "
6165 "initialized", decl);
6169 /* Check that the initializer for a static data member was a
6170 constant. Although we check in the parser that the
6171 initializer is an integral constant expression, we do not
6172 simplify division-by-zero at the point at which it
6173 occurs. Therefore, in:
6175 struct S { static const int i = 7 / 0; };
6177 we issue an error at this point. It would
6178 probably be better to forbid division by zero in
6179 integral constant expressions. */
6180 if (DECL_EXTERNAL (decl) && init)
6182 error ("%qD cannot be initialized by a non-constant expression"
6183 " when being declared", decl);
6184 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6192 The memory occupied by any object of static storage
6193 duration is zero-initialized at program startup before
6194 any other initialization takes place.
6196 We cannot create an appropriate initializer until after
6197 the type of DECL is finalized. If DECL_INITIAL is set,
6198 then the DECL is statically initialized, and any
6199 necessary zero-initialization has already been performed. */
6200 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6201 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6202 /*nelts=*/NULL_TREE,
6203 /*static_storage_p=*/true);
6204 /* Remember that the initialization for this variable has
6206 DECL_INITIALIZED_P (decl) = 1;
6207 /* This declaration is the definition of this variable,
6208 unless we are initializing a static data member within
6209 the class specifier. */
6210 if (!DECL_EXTERNAL (decl))
6211 var_definition_p = true;
6213 /* If the variable has an array type, lay out the type, even if
6214 there is no initializer. It is valid to index through the
6215 array, and we must get TYPE_ALIGN set correctly on the array
6217 else if (TREE_CODE (type) == ARRAY_TYPE)
6220 if (TREE_STATIC (decl)
6221 && !at_function_scope_p ()
6222 && current_function_decl == NULL)
6223 /* So decl is a global variable or a static member of a
6224 non local class. Record the types it uses
6225 so that we can decide later to emit debug info for them. */
6226 record_types_used_by_current_var_decl (decl);
6228 else if (TREE_CODE (decl) == FIELD_DECL
6229 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6230 error ("non-static data member %qD has Java class type", decl);
6232 /* Add this declaration to the statement-tree. This needs to happen
6233 after the call to check_initializer so that the DECL_EXPR for a
6234 reference temp is added before the DECL_EXPR for the reference itself. */
6235 if (DECL_FUNCTION_SCOPE_P (decl))
6236 add_decl_expr (decl);
6238 /* Let the middle end know about variables and functions -- but not
6239 static data members in uninstantiated class templates. */
6240 if (TREE_CODE (decl) == VAR_DECL
6241 || TREE_CODE (decl) == FUNCTION_DECL)
6243 if (TREE_CODE (decl) == VAR_DECL)
6245 layout_var_decl (decl);
6246 maybe_commonize_var (decl);
6249 /* This needs to happen after the linkage is set. */
6250 determine_visibility (decl);
6252 if (var_definition_p && TREE_STATIC (decl))
6254 /* If a TREE_READONLY variable needs initialization
6255 at runtime, it is no longer readonly and we need to
6256 avoid MEM_READONLY_P being set on RTL created for it. */
6259 if (TREE_READONLY (decl))
6260 TREE_READONLY (decl) = 0;
6263 else if (was_readonly)
6264 TREE_READONLY (decl) = 1;
6267 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6269 /* Check for abstractness of the type. Notice that there is no
6270 need to strip array types here since the check for those types
6271 is already done within create_array_type_for_decl. */
6272 if (TREE_CODE (type) == FUNCTION_TYPE
6273 || TREE_CODE (type) == METHOD_TYPE)
6274 abstract_virtuals_error (decl, TREE_TYPE (type));
6276 abstract_virtuals_error (decl, type);
6278 if (TREE_TYPE (decl) == error_mark_node)
6279 /* No initialization required. */
6281 else if (TREE_CODE (decl) == FUNCTION_DECL)
6285 if (init == ridpointers[(int)RID_DEFAULT])
6287 /* An out-of-class default definition is defined at
6288 the point where it is explicitly defaulted. */
6289 if (DECL_DELETED_FN (decl))
6290 maybe_explain_implicit_delete (decl);
6291 else if (DECL_INITIAL (decl) == error_mark_node)
6292 synthesize_method (decl);
6295 error ("function %q#D is initialized like a variable", decl);
6297 /* else no initialization required. */
6299 else if (DECL_EXTERNAL (decl)
6300 && ! (DECL_LANG_SPECIFIC (decl)
6301 && DECL_NOT_REALLY_EXTERN (decl)))
6304 DECL_INITIAL (decl) = init;
6306 /* A variable definition. */
6307 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6308 /* Initialize the local variable. */
6309 initialize_local_var (decl, init);
6311 /* If a variable is defined, and then a subsequent
6312 definition with external linkage is encountered, we will
6313 get here twice for the same variable. We want to avoid
6314 calling expand_static_init more than once. For variables
6315 that are not static data members, we can call
6316 expand_static_init only when we actually process the
6317 initializer. It is not legal to redeclare a static data
6318 member, so this issue does not arise in that case. */
6319 else if (var_definition_p && TREE_STATIC (decl))
6320 expand_static_init (decl, init);
6323 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6324 reference, insert it in the statement-tree now. */
6328 FOR_EACH_VEC_ELT (tree, cleanups, i, t)
6329 push_cleanup (decl, t, false);
6330 release_tree_vector (cleanups);
6334 TREE_READONLY (decl) = 1;
6336 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6339 /* Returns a declaration for a VAR_DECL as if:
6341 extern "C" TYPE NAME;
6343 had been seen. Used to create compiler-generated global
6347 declare_global_var (tree name, tree type)
6351 push_to_top_level ();
6352 decl = build_decl (input_location, VAR_DECL, name, type);
6353 TREE_PUBLIC (decl) = 1;
6354 DECL_EXTERNAL (decl) = 1;
6355 DECL_ARTIFICIAL (decl) = 1;
6356 /* If the user has explicitly declared this variable (perhaps
6357 because the code we are compiling is part of a low-level runtime
6358 library), then it is possible that our declaration will be merged
6359 with theirs by pushdecl. */
6360 decl = pushdecl (decl);
6361 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6362 pop_from_top_level ();
6367 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6368 if "__cxa_atexit" is not being used) corresponding to the function
6369 to be called when the program exits. */
6372 get_atexit_fn_ptr_type (void)
6376 if (!atexit_fn_ptr_type_node)
6379 if (flag_use_cxa_atexit
6380 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6381 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6382 arg_type = ptr_type_node;
6384 /* The parameter to "atexit" is "void (*)(void)". */
6385 arg_type = NULL_TREE;
6387 fn_type = build_function_type_list (void_type_node,
6388 arg_type, NULL_TREE);
6389 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6392 return atexit_fn_ptr_type_node;
6395 /* Returns a pointer to the `atexit' function. Note that if
6396 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6397 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6400 get_atexit_node (void)
6406 bool use_aeabi_atexit;
6411 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6413 /* The declaration for `__cxa_atexit' is:
6415 int __cxa_atexit (void (*)(void *), void *, void *)
6417 We build up the argument types and then the function type
6419 tree argtype0, argtype1, argtype2;
6421 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6422 /* First, build the pointer-to-function type for the first
6424 fn_ptr_type = get_atexit_fn_ptr_type ();
6425 /* Then, build the rest of the argument types. */
6426 argtype2 = ptr_type_node;
6427 if (use_aeabi_atexit)
6429 argtype1 = fn_ptr_type;
6430 argtype0 = ptr_type_node;
6434 argtype1 = ptr_type_node;
6435 argtype0 = fn_ptr_type;
6437 /* And the final __cxa_atexit type. */
6438 fn_type = build_function_type_list (integer_type_node,
6439 argtype0, argtype1, argtype2,
6441 fn_ptr_type = build_pointer_type (fn_type);
6442 if (use_aeabi_atexit)
6443 name = "__aeabi_atexit";
6445 name = "__cxa_atexit";
6449 /* The declaration for `atexit' is:
6451 int atexit (void (*)());
6453 We build up the argument types and then the function type
6455 fn_ptr_type = get_atexit_fn_ptr_type ();
6456 /* Build the final atexit type. */
6457 fn_type = build_function_type_list (integer_type_node,
6458 fn_ptr_type, NULL_TREE);
6462 /* Now, build the function declaration. */
6463 push_lang_context (lang_name_c);
6464 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6465 mark_used (atexit_fndecl);
6466 pop_lang_context ();
6467 atexit_node = decay_conversion (atexit_fndecl);
6472 /* Returns the __dso_handle VAR_DECL. */
6475 get_dso_handle_node (void)
6477 if (dso_handle_node)
6478 return dso_handle_node;
6480 /* Declare the variable. */
6481 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6484 #ifdef HAVE_GAS_HIDDEN
6485 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6486 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6489 return dso_handle_node;
6492 /* Begin a new function with internal linkage whose job will be simply
6493 to destroy some particular variable. */
6495 static GTY(()) int start_cleanup_cnt;
6498 start_cleanup_fn (void)
6503 bool use_cxa_atexit = flag_use_cxa_atexit
6504 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6506 push_to_top_level ();
6508 /* No need to mangle this. */
6509 push_lang_context (lang_name_c);
6511 /* Build the name of the function. */
6512 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6513 /* Build the function declaration. */
6514 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6515 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6516 /* It's a function with internal linkage, generated by the
6518 TREE_PUBLIC (fndecl) = 0;
6519 DECL_ARTIFICIAL (fndecl) = 1;
6520 /* Make the function `inline' so that it is only emitted if it is
6521 actually needed. It is unlikely that it will be inlined, since
6522 it is only called via a function pointer, but we avoid unnecessary
6523 emissions this way. */
6524 DECL_DECLARED_INLINE_P (fndecl) = 1;
6525 DECL_INTERFACE_KNOWN (fndecl) = 1;
6526 /* Build the parameter. */
6531 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6532 DECL_CONTEXT (parmdecl) = fndecl;
6533 TREE_USED (parmdecl) = 1;
6534 DECL_READ_P (parmdecl) = 1;
6535 DECL_ARGUMENTS (fndecl) = parmdecl;
6539 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6541 pop_lang_context ();
6543 return current_function_decl;
6546 /* Finish the cleanup function begun by start_cleanup_fn. */
6549 end_cleanup_fn (void)
6551 expand_or_defer_fn (finish_function (0));
6553 pop_from_top_level ();
6556 /* Generate code to handle the destruction of DECL, an object with
6557 static storage duration. */
6560 register_dtor_fn (tree decl)
6567 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6569 type = TREE_TYPE (decl);
6570 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6571 return void_zero_node;
6573 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6574 a class object, we can just pass the destructor to
6575 "__cxa_atexit"; we don't have to build a temporary function to do
6577 use_dtor = (flag_use_cxa_atexit
6578 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6579 && CLASS_TYPE_P (type));
6584 /* Find the destructor. */
6585 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6586 gcc_assert (idx >= 0);
6587 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6588 /* Make sure it is accessible. */
6589 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6593 /* Call build_cleanup before we enter the anonymous function so
6594 that any access checks will be done relative to the current
6595 scope, rather than the scope of the anonymous function. */
6596 build_cleanup (decl);
6598 /* Now start the function. */
6599 cleanup = start_cleanup_fn ();
6601 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6602 to the original function, rather than the anonymous one. That
6603 will make the back end think that nested functions are in use,
6604 which causes confusion. */
6605 push_deferring_access_checks (dk_no_check);
6606 fcall = build_cleanup (decl);
6607 pop_deferring_access_checks ();
6609 /* Create the body of the anonymous function. */
6610 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6611 finish_expr_stmt (fcall);
6612 finish_compound_stmt (compound_stmt);
6616 /* Call atexit with the cleanup function. */
6617 mark_used (cleanup);
6618 cleanup = build_address (cleanup);
6619 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6625 /* We must convert CLEANUP to the type that "__cxa_atexit"
6627 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6628 /* "__cxa_atexit" will pass the address of DECL to the
6629 cleanup function. */
6631 addr = build_address (decl);
6632 /* The declared type of the parameter to "__cxa_atexit" is
6633 "void *". For plain "T*", we could just let the
6634 machinery in cp_build_function_call convert it -- but if the
6635 type is "cv-qualified T *", then we need to convert it
6636 before passing it in, to avoid spurious errors. */
6637 addr = build_nop (ptr_type_node, addr);
6640 /* Since the cleanup functions we build ignore the address
6641 they're given, there's no reason to pass the actual address
6642 in, and, in general, it's cheaper to pass NULL than any
6644 addr = null_pointer_node;
6645 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6646 tf_warning_or_error);
6647 if (targetm.cxx.use_aeabi_atexit ())
6660 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6661 arg0, arg1, arg2, NULL_TREE);
6664 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6665 is its initializer. Generate code to handle the construction
6666 and destruction of DECL. */
6669 expand_static_init (tree decl, tree init)
6671 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6672 gcc_assert (TREE_STATIC (decl));
6674 /* Some variables require no dynamic initialization. */
6676 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6679 if (DECL_FUNCTION_SCOPE_P (decl))
6681 /* Emit code to perform this initialization but once. */
6682 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6683 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6684 tree guard, guard_addr;
6687 /* Emit code to perform this initialization but once. This code
6690 static <type> guard;
6691 if (!guard.first_byte) {
6692 if (__cxa_guard_acquire (&guard)) {
6695 // Do initialization.
6696 flag = true; __cxa_guard_release (&guard);
6697 // Register variable for destruction at end of program.
6699 if (!flag) __cxa_guard_abort (&guard);
6703 Note that the `flag' variable is only set to 1 *after* the
6704 initialization is complete. This ensures that an exception,
6705 thrown during the construction, will cause the variable to
6706 reinitialized when we pass through this code again, as per:
6710 If the initialization exits by throwing an exception, the
6711 initialization is not complete, so it will be tried again
6712 the next time control enters the declaration.
6714 This process should be thread-safe, too; multiple threads
6715 should not be able to initialize the variable more than
6718 /* Create the guard variable. */
6719 guard = get_guard (decl);
6721 /* This optimization isn't safe on targets with relaxed memory
6722 consistency. On such targets we force synchronization in
6723 __cxa_guard_acquire. */
6724 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6726 /* Begin the conditional initialization. */
6727 if_stmt = begin_if_stmt ();
6728 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6729 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6732 if (flag_threadsafe_statics)
6734 tree vfntype = NULL_TREE;
6735 tree acquire_name, release_name, abort_name;
6736 tree acquire_fn, release_fn, abort_fn;
6737 guard_addr = build_address (guard);
6739 acquire_name = get_identifier ("__cxa_guard_acquire");
6740 release_name = get_identifier ("__cxa_guard_release");
6741 abort_name = get_identifier ("__cxa_guard_abort");
6742 acquire_fn = identifier_global_value (acquire_name);
6743 release_fn = identifier_global_value (release_name);
6744 abort_fn = identifier_global_value (abort_name);
6746 acquire_fn = push_library_fn
6747 (acquire_name, build_function_type_list (integer_type_node,
6748 TREE_TYPE (guard_addr),
6751 if (!release_fn || !abort_fn)
6752 vfntype = build_function_type_list (void_type_node,
6753 TREE_TYPE (guard_addr),
6756 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6758 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6760 inner_if_stmt = begin_if_stmt ();
6761 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6764 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6765 begin = get_target_expr (boolean_false_node);
6766 flag = TARGET_EXPR_SLOT (begin);
6768 TARGET_EXPR_CLEANUP (begin)
6769 = build3 (COND_EXPR, void_type_node, flag,
6771 build_call_n (abort_fn, 1, guard_addr));
6772 CLEANUP_EH_ONLY (begin) = 1;
6774 /* Do the initialization itself. */
6775 init = add_stmt_to_compound (begin, init);
6776 init = add_stmt_to_compound
6777 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6778 init = add_stmt_to_compound
6779 (init, build_call_n (release_fn, 1, guard_addr));
6782 init = add_stmt_to_compound (init, set_guard (guard));
6784 /* Use atexit to register a function for destroying this static
6786 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6788 finish_expr_stmt (init);
6790 if (flag_threadsafe_statics)
6792 finish_compound_stmt (inner_then_clause);
6793 finish_then_clause (inner_if_stmt);
6794 finish_if_stmt (inner_if_stmt);
6797 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6799 finish_compound_stmt (then_clause);
6800 finish_then_clause (if_stmt);
6801 finish_if_stmt (if_stmt);
6805 static_aggregates = tree_cons (init, decl, static_aggregates);
6809 /* Make TYPE a complete type based on INITIAL_VALUE.
6810 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6811 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6812 3 if the initializer list is empty (in pedantic mode). */
6815 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6818 tree type, elt_type;
6822 unsigned HOST_WIDE_INT i;
6825 /* An array of character type can be initialized from a
6826 brace-enclosed string constant.
6828 FIXME: this code is duplicated from reshape_init. Probably
6829 we should just call reshape_init here? */
6830 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6831 && TREE_CODE (initial_value) == CONSTRUCTOR
6832 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6834 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6835 tree value = VEC_index (constructor_elt, v, 0)->value;
6837 if (TREE_CODE (value) == STRING_CST
6838 && VEC_length (constructor_elt, v) == 1)
6839 initial_value = value;
6842 /* If any of the elements are parameter packs, we can't actually
6843 complete this type now because the array size is dependent. */
6844 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6846 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6849 if (PACK_EXPANSION_P (value))
6855 failure = complete_array_type (ptype, initial_value, do_default);
6857 /* We can create the array before the element type is complete, which
6858 means that we didn't have these two bits set in the original type
6859 either. In completing the type, we are expected to propagate these
6860 bits. See also complete_type which does the same thing for arrays
6863 if (TYPE_DOMAIN (type))
6865 elt_type = TREE_TYPE (type);
6866 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6867 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6868 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6874 /* As above, but either give an error or reject zero-size arrays, depending
6878 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6879 bool do_default, tsubst_flags_t complain)
6882 bool sfinae = !(complain & tf_error);
6883 /* In SFINAE context we can't be lenient about zero-size arrays. */
6886 failure = cp_complete_array_type (ptype, initial_value, do_default);
6892 /* Not an error. */;
6893 else if (failure == 1)
6894 error ("initializer fails to determine size of %qT", *ptype);
6895 else if (failure == 2)
6898 error ("array size missing in %qT", *ptype);
6900 else if (failure == 3)
6901 error ("zero-size array %qT", *ptype);
6902 *ptype = error_mark_node;
6907 /* Return zero if something is declared to be a member of type
6908 CTYPE when in the context of CUR_TYPE. STRING is the error
6909 message to print in that case. Otherwise, quietly return 1. */
6912 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6914 if (ctype && ctype != cur_type)
6916 if (flags == DTOR_FLAG)
6917 error ("destructor for alien class %qT cannot be a member", ctype);
6919 error ("constructor for alien class %qT cannot be a member", ctype);
6925 /* Subroutine of `grokdeclarator'. */
6927 /* Generate errors possibly applicable for a given set of specifiers.
6928 This is for ARM $7.1.2. */
6931 bad_specifiers (tree object,
6932 enum bad_spec_place type,
6943 error ("%qD declared as a %<virtual%> variable", object);
6945 error ("%qD declared as an %<inline%> variable", object);
6947 error ("%<const%> and %<volatile%> function specifiers on "
6948 "%qD invalid in variable declaration", object);
6952 error ("%qD declared as a %<virtual%> parameter", object);
6954 error ("%qD declared as an %<inline%> parameter", object);
6956 error ("%<const%> and %<volatile%> function specifiers on "
6957 "%qD invalid in parameter declaration", object);
6961 error ("%qD declared as a %<virtual%> type", object);
6963 error ("%qD declared as an %<inline%> type", object);
6965 error ("%<const%> and %<volatile%> function specifiers on "
6966 "%qD invalid in type declaration", object);
6970 error ("%qD declared as a %<virtual%> field", object);
6972 error ("%qD declared as an %<inline%> field", object);
6974 error ("%<const%> and %<volatile%> function specifiers on "
6975 "%qD invalid in field declaration", object);
6981 error ("%q+D declared as a friend", object);
6983 && (TREE_CODE (object) == TYPE_DECL
6984 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6985 && !TYPE_REFFN_P (TREE_TYPE (object))
6986 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6987 error ("%q+D declared with an exception specification", object);
6990 /* DECL is a member function or static data member and is presently
6991 being defined. Check that the definition is taking place in a
6995 check_class_member_definition_namespace (tree decl)
6997 /* These checks only apply to member functions and static data
6999 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7000 || TREE_CODE (decl) == VAR_DECL);
7001 /* We check for problems with specializations in pt.c in
7002 check_specialization_namespace, where we can issue better
7004 if (processing_specialization)
7006 /* There are no restrictions on the placement of
7007 explicit instantiations. */
7008 if (processing_explicit_instantiation)
7012 A member function definition that appears outside of the
7013 class definition shall appear in a namespace scope enclosing
7014 the class definition.
7018 The definition for a static data member shall appear in a
7019 namespace scope enclosing the member's class definition. */
7020 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7021 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7022 decl, DECL_CONTEXT (decl));
7025 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7026 METHOD_TYPE for a non-static member function; QUALS are the
7027 cv-qualifiers that apply to the function. */
7030 build_this_parm (tree type, cp_cv_quals quals)
7035 cp_cv_quals this_quals;
7037 if (CLASS_TYPE_P (type))
7040 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7041 this_type = build_pointer_type (this_type);
7044 this_type = type_of_this_parm (type);
7045 /* The `this' parameter is implicitly `const'; it cannot be
7047 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7048 qual_type = cp_build_qualified_type (this_type, this_quals);
7049 parm = build_artificial_parm (this_identifier, qual_type);
7050 cp_apply_type_quals_to_decl (this_quals, parm);
7054 /* DECL is a static member function. Complain if it was declared
7055 with function-cv-quals. */
7058 check_static_quals (tree decl, cp_cv_quals quals)
7060 if (quals != TYPE_UNQUALIFIED)
7061 error ("static member function %q#D declared with type qualifiers",
7065 /* CTYPE is class type, or null if non-class.
7066 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7068 DECLARATOR is the function's name.
7069 PARMS is a chain of PARM_DECLs for the function.
7070 VIRTUALP is truthvalue of whether the function is virtual or not.
7071 FLAGS are to be passed through to `grokclassfn'.
7072 QUALS are qualifiers indicating whether the function is `const'
7074 RAISES is a list of exceptions that this function can raise.
7075 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7076 not look, and -1 if we should not call `grokclassfn' at all.
7078 SFK is the kind of special function (if any) for the new function.
7080 Returns `NULL_TREE' if something goes wrong, after issuing
7081 applicable error messages. */
7084 grokfndecl (tree ctype,
7088 tree orig_declarator,
7090 enum overload_flags flags,
7097 special_function_kind sfk,
7102 location_t location)
7105 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7109 type = build_exception_variant (type, raises);
7111 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7113 /* If we have an explicit location, use it, otherwise use whatever
7114 build_lang_decl used (probably input_location). */
7115 if (location != UNKNOWN_LOCATION)
7116 DECL_SOURCE_LOCATION (decl) = location;
7118 if (TREE_CODE (type) == METHOD_TYPE)
7121 parm = build_this_parm (type, quals);
7122 DECL_CHAIN (parm) = parms;
7125 DECL_ARGUMENTS (decl) = parms;
7126 for (t = parms; t; t = DECL_CHAIN (t))
7127 DECL_CONTEXT (t) = decl;
7128 /* Propagate volatile out from type to decl. */
7129 if (TYPE_VOLATILE (type))
7130 TREE_THIS_VOLATILE (decl) = 1;
7132 /* Setup decl according to sfk. */
7135 case sfk_constructor:
7136 case sfk_copy_constructor:
7137 case sfk_move_constructor:
7138 DECL_CONSTRUCTOR_P (decl) = 1;
7140 case sfk_destructor:
7141 DECL_DESTRUCTOR_P (decl) = 1;
7147 /* If pointers to member functions use the least significant bit to
7148 indicate whether a function is virtual, ensure a pointer
7149 to this function will have that bit clear. */
7150 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7151 && TREE_CODE (type) == METHOD_TYPE
7152 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7153 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7156 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7160 ("defining explicit specialization %qD in friend declaration",
7164 tree fns = TREE_OPERAND (orig_declarator, 0);
7165 tree args = TREE_OPERAND (orig_declarator, 1);
7167 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7169 /* Something like `template <class T> friend void f<T>()'. */
7170 error ("invalid use of template-id %qD in declaration "
7171 "of primary template",
7177 /* A friend declaration of the form friend void f<>(). Record
7178 the information in the TEMPLATE_ID_EXPR. */
7179 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7181 if (TREE_CODE (fns) == COMPONENT_REF)
7183 /* Due to bison parser ickiness, we will have already looked
7184 up an operator_name or PFUNCNAME within the current class
7185 (see template_id in parse.y). If the current class contains
7186 such a name, we'll get a COMPONENT_REF here. Undo that. */
7188 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7189 == current_class_type);
7190 fns = TREE_OPERAND (fns, 1);
7192 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7193 || TREE_CODE (fns) == OVERLOAD);
7194 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7196 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7197 if (TREE_PURPOSE (t)
7198 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7200 error ("default arguments are not allowed in declaration "
7201 "of friend template specialization %qD",
7208 error ("%<inline%> is not allowed in declaration of friend "
7209 "template specialization %qD",
7216 /* If this decl has namespace scope, set that up. */
7218 set_decl_namespace (decl, in_namespace, friendp);
7220 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7222 /* `main' and builtins have implicit 'C' linkage. */
7223 if ((MAIN_NAME_P (declarator)
7224 || (IDENTIFIER_LENGTH (declarator) > 10
7225 && IDENTIFIER_POINTER (declarator)[0] == '_'
7226 && IDENTIFIER_POINTER (declarator)[1] == '_'
7227 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7228 && current_lang_name == lang_name_cplusplus
7229 && ctype == NULL_TREE
7230 && DECL_FILE_SCOPE_P (decl))
7231 SET_DECL_LANGUAGE (decl, lang_c);
7233 /* Should probably propagate const out from type to decl I bet (mrs). */
7236 DECL_STATIC_FUNCTION_P (decl) = 1;
7237 DECL_CONTEXT (decl) = ctype;
7242 DECL_CONTEXT (decl) = ctype;
7244 check_class_member_definition_namespace (decl);
7247 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7249 if (processing_template_decl)
7250 error ("cannot declare %<::main%> to be a template");
7252 error ("cannot declare %<::main%> to be inline");
7254 error ("cannot declare %<::main%> to be static");
7259 /* Members of anonymous types and local classes have no linkage; make
7260 them internal. If a typedef is made later, this will be changed. */
7261 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7262 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7265 if (publicp && cxx_dialect == cxx98)
7267 /* [basic.link]: A name with no linkage (notably, the name of a class
7268 or enumeration declared in a local scope) shall not be used to
7269 declare an entity with linkage.
7271 DR 757 relaxes this restriction for C++0x. */
7272 t = no_linkage_check (TREE_TYPE (decl),
7273 /*relaxed_p=*/false);
7276 if (TYPE_ANONYMOUS_P (t))
7278 if (DECL_EXTERN_C_P (decl))
7279 /* Allow this; it's pretty common in C. */;
7282 permerror (input_location, "anonymous type with no linkage "
7283 "used to declare function %q#D with linkage",
7285 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7286 permerror (input_location, "%q+#D does not refer to the unqualified "
7287 "type, so it is not used for linkage",
7292 permerror (input_location, "type %qT with no linkage used to "
7293 "declare function %q#D with linkage", t, decl);
7297 TREE_PUBLIC (decl) = publicp;
7300 DECL_INTERFACE_KNOWN (decl) = 1;
7301 DECL_NOT_REALLY_EXTERN (decl) = 1;
7304 /* If the declaration was declared inline, mark it as such. */
7306 DECL_DECLARED_INLINE_P (decl) = 1;
7308 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7310 DECL_EXTERNAL (decl) = 1;
7311 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7314 ? G_("static member function %qD cannot have cv-qualifier")
7315 : G_("non-member function %qD cannot have cv-qualifier"),
7317 quals = TYPE_UNQUALIFIED;
7320 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7321 && !grok_op_properties (decl, /*complain=*/true))
7323 else if (UDLIT_OPER_P (DECL_NAME (decl)))
7325 bool long_long_unsigned_p;
7327 const char *suffix = NULL;
7328 /* [over.literal]/6: Literal operators shall not have C linkage. */
7329 if (DECL_LANGUAGE (decl) == lang_c)
7331 error ("literal operator with C linkage");
7335 if (DECL_NAMESPACE_SCOPE_P (decl))
7337 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
7340 error ("%qD has invalid argument list", decl);
7344 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
7345 if (long_long_unsigned_p)
7347 if (cpp_interpret_int_suffix (suffix, strlen (suffix)))
7348 warning (0, "integer suffix %<%s%>"
7349 " shadowed by implementation", suffix);
7351 else if (long_double_p)
7353 if (cpp_interpret_float_suffix (suffix, strlen (suffix)))
7354 warning (0, "floating point suffix %<%s%>"
7355 " shadowed by implementation", suffix);
7360 error ("%qD must be a non-member function", decl);
7366 /* Make the init_value nonzero so pushdecl knows this is not
7367 tentative. error_mark_node is replaced later with the BLOCK. */
7368 DECL_INITIAL (decl) = error_mark_node;
7370 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7371 TREE_NOTHROW (decl) = 1;
7373 /* Caller will do the rest of this. */
7377 if (ctype != NULL_TREE)
7378 grokclassfn (ctype, decl, flags);
7380 decl = check_explicit_specialization (orig_declarator, decl,
7383 4 * (friendp != 0));
7384 if (decl == error_mark_node)
7387 if (DECL_STATIC_FUNCTION_P (decl))
7388 check_static_quals (decl, quals);
7392 cplus_decl_attributes (&decl, *attrlist, 0);
7393 *attrlist = NULL_TREE;
7396 /* Check main's type after attributes have been applied. */
7397 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7399 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7402 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7404 error ("%<::main%> must return %<int%>");
7405 newtype = build_function_type (integer_type_node, oldtypeargs);
7406 TREE_TYPE (decl) = newtype;
7409 check_main_parameter_types (decl);
7412 if (ctype != NULL_TREE
7413 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7416 tree old_decl = check_classfn (ctype, decl,
7417 (processing_template_decl
7418 > template_class_depth (ctype))
7419 ? current_template_parms
7422 if (old_decl == error_mark_node)
7430 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7431 /* Because grokfndecl is always supposed to return a
7432 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7433 here. We depend on our callers to figure out that its
7434 really a template that's being returned. */
7435 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7437 if (DECL_STATIC_FUNCTION_P (old_decl)
7438 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7440 /* Remove the `this' parm added by grokclassfn. */
7441 revert_static_member_fn (decl);
7442 check_static_quals (decl, quals);
7444 if (DECL_ARTIFICIAL (old_decl))
7446 error ("definition of implicitly-declared %qD", old_decl);
7449 else if (DECL_DEFAULTED_FN (old_decl))
7451 error ("definition of explicitly-defaulted %q+D", decl);
7452 error ("%q+#D explicitly defaulted here", old_decl);
7456 /* Since we've smashed OLD_DECL to its
7457 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7458 if (TREE_CODE (decl) == TEMPLATE_DECL)
7459 decl = DECL_TEMPLATE_RESULT (decl);
7461 /* Attempt to merge the declarations. This can fail, in
7462 the case of some invalid specialization declarations. */
7463 pushed_scope = push_scope (ctype);
7464 ok = duplicate_decls (decl, old_decl, friendp);
7466 pop_scope (pushed_scope);
7469 error ("no %q#D member function declared in class %qT",
7477 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7480 if (ctype == NULL_TREE || check)
7484 DECL_VIRTUAL_P (decl) = 1;
7489 /* decl is a FUNCTION_DECL.
7490 specifiers are the parsed virt-specifiers.
7492 Set flags to reflect the virt-specifiers.
7497 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7499 if (decl == NULL_TREE)
7501 if (specifiers & VIRT_SPEC_OVERRIDE)
7502 DECL_OVERRIDE_P (decl) = 1;
7503 if (specifiers & VIRT_SPEC_FINAL)
7504 DECL_FINAL_P (decl) = 1;
7508 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7509 the linkage that DECL will receive in the object file. */
7512 set_linkage_for_static_data_member (tree decl)
7514 /* A static data member always has static storage duration and
7515 external linkage. Note that static data members are forbidden in
7516 local classes -- the only situation in which a class has
7517 non-external linkage. */
7518 TREE_PUBLIC (decl) = 1;
7519 TREE_STATIC (decl) = 1;
7520 /* For non-template classes, static data members are always put
7521 out in exactly those files where they are defined, just as
7522 with ordinary namespace-scope variables. */
7523 if (!processing_template_decl)
7524 DECL_INTERFACE_KNOWN (decl) = 1;
7527 /* Create a VAR_DECL named NAME with the indicated TYPE.
7529 If SCOPE is non-NULL, it is the class type or namespace containing
7530 the variable. If SCOPE is NULL, the variable should is created in
7531 the innermost enclosings scope. */
7534 grokvardecl (tree type,
7536 const cp_decl_specifier_seq *declspecs,
7542 tree explicit_scope;
7544 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7546 /* Compute the scope in which to place the variable, but remember
7547 whether or not that scope was explicitly specified by the user. */
7548 explicit_scope = scope;
7551 /* An explicit "extern" specifier indicates a namespace-scope
7553 if (declspecs->storage_class == sc_extern)
7554 scope = current_decl_namespace ();
7555 else if (!at_function_scope_p ())
7556 scope = current_scope ();
7560 && (/* If the variable is a namespace-scope variable declared in a
7561 template, we need DECL_LANG_SPECIFIC. */
7562 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7563 /* Similarly for namespace-scope variables with language linkage
7565 || (TREE_CODE (scope) == NAMESPACE_DECL
7566 && current_lang_name != lang_name_cplusplus)
7567 /* Similarly for static data members. */
7569 decl = build_lang_decl (VAR_DECL, name, type);
7571 decl = build_decl (input_location, VAR_DECL, name, type);
7573 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7574 set_decl_namespace (decl, explicit_scope, 0);
7576 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7578 if (declspecs->storage_class == sc_extern)
7580 DECL_THIS_EXTERN (decl) = 1;
7581 DECL_EXTERNAL (decl) = !initialized;
7584 if (DECL_CLASS_SCOPE_P (decl))
7586 set_linkage_for_static_data_member (decl);
7587 /* This function is only called with out-of-class definitions. */
7588 DECL_EXTERNAL (decl) = 0;
7589 check_class_member_definition_namespace (decl);
7591 /* At top level, either `static' or no s.c. makes a definition
7592 (perhaps tentative), and absence of `static' makes it public. */
7593 else if (toplevel_bindings_p ())
7595 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7596 && (DECL_THIS_EXTERN (decl) || ! constp));
7597 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7599 /* Not at top level, only `static' makes a static definition. */
7602 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7603 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7606 if (declspecs->specs[(int)ds_thread])
7607 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7609 /* If the type of the decl has no linkage, make sure that we'll
7610 notice that in mark_used. */
7611 if (cxx_dialect > cxx98
7612 && decl_linkage (decl) != lk_none
7613 && DECL_LANG_SPECIFIC (decl) == NULL
7614 && !DECL_EXTERN_C_P (decl)
7615 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7616 retrofit_lang_decl (decl);
7618 if (TREE_PUBLIC (decl))
7620 /* [basic.link]: A name with no linkage (notably, the name of a class
7621 or enumeration declared in a local scope) shall not be used to
7622 declare an entity with linkage.
7624 DR 757 relaxes this restriction for C++0x. */
7625 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7626 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7629 if (TYPE_ANONYMOUS_P (t))
7631 if (DECL_EXTERN_C_P (decl))
7632 /* Allow this; it's pretty common in C. */
7636 /* DRs 132, 319 and 389 seem to indicate types with
7637 no linkage can only be used to declare extern "C"
7638 entities. Since it's not always an error in the
7639 ISO C++ 90 Standard, we only issue a warning. */
7640 warning (0, "anonymous type with no linkage used to declare "
7641 "variable %q#D with linkage", decl);
7642 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7643 warning (0, "%q+#D does not refer to the unqualified "
7644 "type, so it is not used for linkage",
7649 warning (0, "type %qT with no linkage used to declare variable "
7650 "%q#D with linkage", t, decl);
7654 DECL_INTERFACE_KNOWN (decl) = 1;
7659 /* Create and return a canonical pointer to member function type, for
7660 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7663 build_ptrmemfunc_type (tree type)
7667 tree unqualified_variant = NULL_TREE;
7669 if (type == error_mark_node)
7672 /* If a canonical type already exists for this type, use it. We use
7673 this method instead of type_hash_canon, because it only does a
7674 simple equality check on the list of field members. */
7676 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7679 /* Make sure that we always have the unqualified pointer-to-member
7681 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7683 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7685 t = make_class_type (RECORD_TYPE);
7686 xref_basetypes (t, NULL_TREE);
7688 /* Let the front end know this is a pointer to member function... */
7689 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7690 /* ... and not really a class type. */
7691 SET_CLASS_TYPE_P (t, 0);
7693 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7696 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7698 DECL_CHAIN (field) = fields;
7701 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7703 /* Zap out the name so that the back end will give us the debugging
7704 information for this anonymous RECORD_TYPE. */
7705 TYPE_NAME (t) = NULL_TREE;
7707 /* If this is not the unqualified form of this pointer-to-member
7708 type, set the TYPE_MAIN_VARIANT for this type to be the
7709 unqualified type. Since they are actually RECORD_TYPEs that are
7710 not variants of each other, we must do this manually.
7711 As we just built a new type there is no need to do yet another copy. */
7712 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7714 int type_quals = cp_type_quals (type);
7715 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7716 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7717 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7718 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7719 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7720 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7721 TREE_TYPE (TYPE_BINFO (t)) = t;
7724 /* Cache this pointer-to-member type so that we can find it again
7726 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7728 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7729 SET_TYPE_STRUCTURAL_EQUALITY (t);
7730 else if (TYPE_CANONICAL (type) != type)
7731 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7736 /* Create and return a pointer to data member type. */
7739 build_ptrmem_type (tree class_type, tree member_type)
7741 if (TREE_CODE (member_type) == METHOD_TYPE)
7743 cp_cv_quals quals = type_memfn_quals (member_type);
7744 member_type = build_memfn_type (member_type, class_type, quals);
7745 return build_ptrmemfunc_type (build_pointer_type (member_type));
7749 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7750 return build_offset_type (class_type, member_type);
7754 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7755 Check to see that the definition is valid. Issue appropriate error
7756 messages. Return 1 if the definition is particularly bad, or 0
7760 check_static_variable_definition (tree decl, tree type)
7762 /* Can't check yet if we don't know the type. */
7763 if (dependent_type_p (type))
7765 /* If DECL is declared constexpr, we'll do the appropriate checks
7766 in check_initializer. */
7767 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7769 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7771 if (literal_type_p (type))
7772 permerror (input_location,
7773 "%<constexpr%> needed for in-class initialization of "
7774 "static data member %q#D of non-integral type", decl);
7776 error ("in-class initialization of static data member %q#D of "
7777 "non-literal type", decl);
7781 /* Motion 10 at San Diego: If a static const integral data member is
7782 initialized with an integral constant expression, the initializer
7783 may appear either in the declaration (within the class), or in
7784 the definition, but not both. If it appears in the class, the
7785 member is a member constant. The file-scope definition is always
7787 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7789 error ("invalid in-class initialization of static data member "
7790 "of non-integral type %qT",
7794 else if (!CP_TYPE_CONST_P (type))
7795 error ("ISO C++ forbids in-class initialization of non-const "
7796 "static member %qD",
7798 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7799 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7800 "%qD of non-integral type %qT", decl, type);
7805 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7806 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7807 expressions out into temporary variables so that walk_tree doesn't
7808 step into them (c++/15764). */
7811 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7813 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7814 tree expr = *expr_p;
7815 if (TREE_CODE (expr) == SAVE_EXPR)
7817 tree op = TREE_OPERAND (expr, 0);
7818 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7819 if (TREE_SIDE_EFFECTS (op))
7820 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7823 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7828 /* Entry point for the above. */
7831 stabilize_vla_size (tree size)
7833 struct pointer_set_t *pset = pointer_set_create ();
7834 /* Break out any function calls into temporary variables. */
7835 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7838 /* Given the SIZE (i.e., number of elements) in an array, compute an
7839 appropriate index type for the array. If non-NULL, NAME is the
7840 name of the thing being declared. */
7843 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7848 tree abi_1_itype = NULL_TREE;
7850 if (error_operand_p (size))
7851 return error_mark_node;
7853 type = TREE_TYPE (size);
7854 /* type_dependent_expression_p? */
7855 if (!dependent_type_p (type))
7857 mark_rvalue_use (size);
7859 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7860 && TREE_SIDE_EFFECTS (size))
7861 /* In C++98, we mark a non-constant array bound with a magic
7862 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7865 size = fold_non_dependent_expr (size);
7867 if (CLASS_TYPE_P (type)
7868 && CLASSTYPE_LITERAL_P (type))
7870 size = build_expr_type_conversion (WANT_INT, size, true);
7873 if (!(complain & tf_error))
7874 return error_mark_node;
7876 error ("size of array %qD has non-integral type %qT",
7879 error ("size of array has non-integral type %qT", type);
7880 size = integer_one_node;
7882 if (size == error_mark_node)
7883 return error_mark_node;
7884 type = TREE_TYPE (size);
7885 /* We didn't support this case in GCC 3.2, so don't bother
7886 trying to model it now in ABI v1. */
7887 abi_1_itype = error_mark_node;
7890 size = maybe_constant_value (size);
7891 if (!TREE_CONSTANT (size))
7895 if (error_operand_p (size))
7896 return error_mark_node;
7898 /* The array bound must be an integer type. */
7899 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7901 if (!(complain & tf_error))
7902 return error_mark_node;
7904 error ("size of array %qD has non-integral type %qT", name, type);
7906 error ("size of array has non-integral type %qT", type);
7907 size = integer_one_node;
7908 type = TREE_TYPE (size);
7912 /* A type is dependent if it is...an array type constructed from any
7913 dependent type or whose size is specified by a constant expression
7914 that is value-dependent. */
7915 /* We can only call value_dependent_expression_p on integral constant
7916 expressions; treat non-constant expressions as dependent, too. */
7917 if (processing_template_decl
7918 && (dependent_type_p (type)
7919 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7921 /* We cannot do any checking for a SIZE that isn't known to be
7922 constant. Just build the index type and mark that it requires
7923 structural equality checks. */
7924 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7925 size, integer_one_node));
7926 TYPE_DEPENDENT_P (itype) = 1;
7927 TYPE_DEPENDENT_P_VALID (itype) = 1;
7928 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7932 if (!abi_version_at_least (2) && processing_template_decl
7933 && abi_1_itype == NULL_TREE)
7934 /* For abi-1, we handled all instances in templates the same way,
7935 even when they were non-dependent. This affects the manglings
7936 produced. So, we do the normal checking for non-dependent
7937 sizes, but at the end we'll return the same type that abi-1
7938 would have, but with TYPE_CANONICAL set to the "right"
7939 value that the current ABI would provide. */
7940 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7941 osize, integer_one_node));
7943 /* Normally, the array-bound will be a constant. */
7944 if (TREE_CODE (size) == INTEGER_CST)
7946 /* Check to see if the array bound overflowed. Make that an
7947 error, no matter how generous we're being. */
7948 constant_expression_error (size);
7950 /* An array must have a positive number of elements. */
7951 if (INT_CST_LT (size, integer_zero_node))
7953 if (!(complain & tf_error))
7954 return error_mark_node;
7956 error ("size of array %qD is negative", name);
7958 error ("size of array is negative");
7959 size = integer_one_node;
7961 /* As an extension we allow zero-sized arrays. */
7962 else if (integer_zerop (size))
7964 if (!(complain & tf_error))
7965 /* We must fail if performing argument deduction (as
7966 indicated by the state of complain), so that
7967 another substitution can be found. */
7968 return error_mark_node;
7969 else if (in_system_header)
7970 /* Allow them in system headers because glibc uses them. */;
7972 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7974 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7977 else if (TREE_CONSTANT (size)
7978 /* We don't allow VLAs at non-function scopes, or during
7979 tentative template substitution. */
7980 || !at_function_scope_p () || !(complain & tf_error))
7982 if (!(complain & tf_error))
7983 return error_mark_node;
7984 /* `(int) &fn' is not a valid array bound. */
7986 error ("size of array %qD is not an integral constant-expression",
7989 error ("size of array is not an integral constant-expression");
7990 size = integer_one_node;
7992 else if (pedantic && warn_vla != 0)
7995 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7997 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7999 else if (warn_vla > 0)
8003 "variable length array %qD is used", name);
8006 "variable length array is used");
8009 if (processing_template_decl && !TREE_CONSTANT (size))
8010 /* A variable sized array. */
8011 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8014 HOST_WIDE_INT saved_processing_template_decl;
8016 /* Compute the index of the largest element in the array. It is
8017 one less than the number of elements in the array. We save
8018 and restore PROCESSING_TEMPLATE_DECL so that computations in
8019 cp_build_binary_op will be appropriately folded. */
8020 saved_processing_template_decl = processing_template_decl;
8021 processing_template_decl = 0;
8022 itype = cp_build_binary_op (input_location,
8024 cp_convert (ssizetype, size),
8025 cp_convert (ssizetype, integer_one_node),
8026 tf_warning_or_error);
8027 itype = fold (itype);
8028 processing_template_decl = saved_processing_template_decl;
8030 if (!TREE_CONSTANT (itype))
8031 /* A variable sized array. */
8032 itype = variable_size (itype);
8033 /* Make sure that there was no overflow when creating to a signed
8034 index type. (For example, on a 32-bit machine, an array with
8035 size 2^32 - 1 is too big.) */
8036 else if (TREE_CODE (itype) == INTEGER_CST
8037 && TREE_OVERFLOW (itype))
8039 if (!(complain & tf_error))
8040 return error_mark_node;
8041 error ("overflow in array dimension");
8042 TREE_OVERFLOW (itype) = 0;
8046 /* Create and return the appropriate index type. */
8047 if (abi_1_itype && abi_1_itype != error_mark_node)
8049 tree t = build_index_type (itype);
8050 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
8051 itype = abi_1_itype;
8054 itype = build_index_type (itype);
8056 /* If the index type were dependent, we would have returned early, so
8057 remember that it isn't. */
8058 TYPE_DEPENDENT_P (itype) = 0;
8059 TYPE_DEPENDENT_P_VALID (itype) = 1;
8063 /* Returns the scope (if any) in which the entity declared by
8064 DECLARATOR will be located. If the entity was declared with an
8065 unqualified name, NULL_TREE is returned. */
8068 get_scope_of_declarator (const cp_declarator *declarator)
8070 while (declarator && declarator->kind != cdk_id)
8071 declarator = declarator->declarator;
8073 /* If the declarator-id is a SCOPE_REF, the scope in which the
8074 declaration occurs is the first operand. */
8076 && declarator->u.id.qualifying_scope)
8077 return declarator->u.id.qualifying_scope;
8079 /* Otherwise, the declarator is not a qualified name; the entity will
8080 be declared in the current scope. */
8084 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8085 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8089 create_array_type_for_decl (tree name, tree type, tree size)
8091 tree itype = NULL_TREE;
8093 /* If things have already gone awry, bail now. */
8094 if (type == error_mark_node || size == error_mark_node)
8095 return error_mark_node;
8097 /* 8.3.4/1: If the type of the identifier of D contains the auto
8098 type-specifier, the program is ill-formed. */
8099 if (pedantic && type_uses_auto (type))
8100 pedwarn (input_location, OPT_pedantic,
8101 "declaration of %qD as array of %<auto%>", name);
8103 /* If there are some types which cannot be array elements,
8104 issue an error-message and return. */
8105 switch (TREE_CODE (type))
8109 error ("declaration of %qD as array of void", name);
8111 error ("creating array of void");
8112 return error_mark_node;
8116 error ("declaration of %qD as array of functions", name);
8118 error ("creating array of functions");
8119 return error_mark_node;
8121 case REFERENCE_TYPE:
8123 error ("declaration of %qD as array of references", name);
8125 error ("creating array of references");
8126 return error_mark_node;
8130 error ("declaration of %qD as array of function members", name);
8132 error ("creating array of function members");
8133 return error_mark_node;
8141 The constant expressions that specify the bounds of the arrays
8142 can be omitted only for the first member of the sequence. */
8143 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8146 error ("declaration of %qD as multidimensional array must "
8147 "have bounds for all dimensions except the first",
8150 error ("multidimensional array must have bounds for all "
8151 "dimensions except the first");
8153 return error_mark_node;
8156 /* Figure out the index type for the array. */
8158 itype = compute_array_index_type (name, size, tf_warning_or_error);
8161 T is called the array element type; this type shall not be [...] an
8162 abstract class type. */
8163 abstract_virtuals_error (name, type);
8165 return build_cplus_array_type (type, itype);
8168 /* Check that it's OK to declare a function with the indicated TYPE.
8169 SFK indicates the kind of special function (if any) that this
8170 function is. OPTYPE is the type given in a conversion operator
8171 declaration, or the class type for a constructor/destructor.
8172 Returns the actual return type of the function; that
8173 may be different than TYPE if an error occurs, or for certain
8174 special functions. */
8177 check_special_function_return_type (special_function_kind sfk,
8183 case sfk_constructor:
8185 error ("return type specification for constructor invalid");
8187 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8188 type = build_pointer_type (optype);
8190 type = void_type_node;
8193 case sfk_destructor:
8195 error ("return type specification for destructor invalid");
8196 /* We can't use the proper return type here because we run into
8197 problems with ambiguous bases and covariant returns.
8198 Java classes are left unchanged because (void *) isn't a valid
8199 Java type, and we don't want to change the Java ABI. */
8200 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8201 type = build_pointer_type (void_type_node);
8203 type = void_type_node;
8206 case sfk_conversion:
8208 error ("return type specified for %<operator %T%>", optype);
8219 /* A variable or data member (whose unqualified name is IDENTIFIER)
8220 has been declared with the indicated TYPE. If the TYPE is not
8221 acceptable, issue an error message and return a type to use for
8222 error-recovery purposes. */
8225 check_var_type (tree identifier, tree type)
8227 if (VOID_TYPE_P (type))
8230 error ("unnamed variable or field declared void");
8231 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8233 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8234 error ("variable or field %qE declared void", identifier);
8237 error ("variable or field declared void");
8238 type = error_mark_node;
8244 /* Given declspecs and a declarator (abstract or otherwise), determine
8245 the name and type of the object declared and construct a DECL node
8248 DECLSPECS points to the representation of declaration-specifier
8249 sequence that precedes declarator.
8251 DECL_CONTEXT says which syntactic context this declaration is in:
8252 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8253 FUNCDEF for a function definition. Like NORMAL but a few different
8254 error messages in each case. Return value may be zero meaning
8255 this definition is too screwy to try to parse.
8256 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8257 handle member functions (which have FIELD context).
8258 Return value may be zero meaning this definition is too screwy to
8260 PARM for a parameter declaration (either within a function prototype
8261 or before a function body). Make a PARM_DECL, or return void_type_node.
8262 TPARM for a template parameter declaration.
8263 CATCHPARM for a parameter declaration before a catch clause.
8264 TYPENAME if for a typename (in a cast or sizeof).
8265 Don't make a DECL node; just return the ..._TYPE node.
8266 FIELD for a struct or union field; make a FIELD_DECL.
8267 BITFIELD for a field with specified width.
8269 INITIALIZED is as for start_decl.
8271 ATTRLIST is a pointer to the list of attributes, which may be NULL
8272 if there are none; *ATTRLIST may be modified if attributes from inside
8273 the declarator should be applied to the declaration.
8275 When this function is called, scoping variables (such as
8276 CURRENT_CLASS_TYPE) should reflect the scope in which the
8277 declaration occurs, not the scope in which the new declaration will
8278 be placed. For example, on:
8282 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8285 Returns a DECL (if a declarator is present), a TYPE (if there is no
8286 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8290 grokdeclarator (const cp_declarator *declarator,
8291 const cp_decl_specifier_seq *declspecs,
8292 enum decl_context decl_context,
8296 tree type = NULL_TREE;
8298 int explicit_int128 = 0;
8299 int virtualp, explicitp, friendp, inlinep, staticp;
8300 int explicit_int = 0;
8301 int explicit_char = 0;
8302 int defaulted_int = 0;
8303 tree dependent_name = NULL_TREE;
8305 tree typedef_decl = NULL_TREE;
8306 const char *name = NULL;
8307 tree typedef_type = NULL_TREE;
8308 /* True if this declarator is a function definition. */
8309 bool funcdef_flag = false;
8310 cp_declarator_kind innermost_code = cdk_error;
8313 /* See the code below that used this. */
8314 tree decl_attr = NULL_TREE;
8317 /* Keep track of what sort of function is being processed
8318 so that we can warn about default return values, or explicit
8319 return values which do not match prescribed defaults. */
8320 special_function_kind sfk = sfk_none;
8322 tree dname = NULL_TREE;
8323 tree ctor_return_type = NULL_TREE;
8324 enum overload_flags flags = NO_SPECIAL;
8325 /* cv-qualifiers that apply to the declarator, for a declaration of
8326 a member function. */
8327 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8328 /* virt-specifiers that apply to the declarator, for a declaration of
8329 a member function. */
8330 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8331 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8333 tree raises = NULL_TREE;
8334 int template_count = 0;
8335 tree returned_attrs = NULL_TREE;
8336 tree parms = NULL_TREE;
8337 const cp_declarator *id_declarator;
8338 /* The unqualified name of the declarator; either an
8339 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8340 tree unqualified_id;
8341 /* The class type, if any, in which this entity is located,
8342 or NULL_TREE if none. Note that this value may be different from
8343 the current class type; for example if an attempt is made to declare
8344 "A::f" inside "B", this value will be "A". */
8345 tree ctype = current_class_type;
8346 /* The NAMESPACE_DECL for the namespace in which this entity is
8347 located. If an unqualified name is used to declare the entity,
8348 this value will be NULL_TREE, even if the entity is located at
8350 tree in_namespace = NULL_TREE;
8351 cp_storage_class storage_class;
8352 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8353 bool type_was_error_mark_node = false;
8354 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8355 bool template_type_arg = false;
8356 bool template_parm_flag = false;
8357 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8360 signed_p = declspecs->specs[(int)ds_signed];
8361 unsigned_p = declspecs->specs[(int)ds_unsigned];
8362 short_p = declspecs->specs[(int)ds_short];
8363 long_p = declspecs->specs[(int)ds_long];
8364 longlong = declspecs->specs[(int)ds_long] >= 2;
8365 explicit_int128 = declspecs->explicit_int128_p;
8366 thread_p = declspecs->specs[(int)ds_thread];
8368 if (decl_context == FUNCDEF)
8369 funcdef_flag = true, decl_context = NORMAL;
8370 else if (decl_context == MEMFUNCDEF)
8371 funcdef_flag = true, decl_context = FIELD;
8372 else if (decl_context == BITFIELD)
8373 bitfield = 1, decl_context = FIELD;
8374 else if (decl_context == TEMPLATE_TYPE_ARG)
8375 template_type_arg = true, decl_context = TYPENAME;
8376 else if (decl_context == TPARM)
8377 template_parm_flag = true, decl_context = PARM;
8379 if (initialized > 1)
8380 funcdef_flag = true;
8382 /* Look inside a declarator for the name being declared
8383 and get it as a string, for an error message. */
8384 for (id_declarator = declarator;
8386 id_declarator = id_declarator->declarator)
8388 if (id_declarator->kind != cdk_id)
8389 innermost_code = id_declarator->kind;
8391 switch (id_declarator->kind)
8394 if (id_declarator->declarator
8395 && id_declarator->declarator->kind == cdk_id)
8397 sfk = id_declarator->declarator->u.id.sfk;
8398 if (sfk == sfk_destructor)
8405 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8406 tree decl = id_declarator->u.id.unqualified_name;
8409 if (qualifying_scope)
8411 if (at_function_scope_p ())
8415 A declarator-id shall not be qualified except
8418 None of the cases are permitted in block
8420 if (qualifying_scope == global_namespace)
8421 error ("invalid use of qualified-name %<::%D%>",
8423 else if (TYPE_P (qualifying_scope))
8424 error ("invalid use of qualified-name %<%T::%D%>",
8425 qualifying_scope, decl);
8427 error ("invalid use of qualified-name %<%D::%D%>",
8428 qualifying_scope, decl);
8429 return error_mark_node;
8431 else if (TYPE_P (qualifying_scope))
8433 ctype = qualifying_scope;
8434 if (!MAYBE_CLASS_TYPE_P (ctype))
8436 error ("%q#T is not a class or a namespace", ctype);
8439 else if (innermost_code != cdk_function
8440 && current_class_type
8441 && !UNIQUELY_DERIVED_FROM_P (ctype,
8442 current_class_type))
8444 error ("type %qT is not derived from type %qT",
8445 ctype, current_class_type);
8446 return error_mark_node;
8449 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8450 in_namespace = qualifying_scope;
8452 switch (TREE_CODE (decl))
8458 if (innermost_code != cdk_function)
8460 error ("declaration of %qD as non-function", decl);
8461 return error_mark_node;
8463 else if (!qualifying_scope
8464 && !(current_class_type && at_class_scope_p ()))
8466 error ("declaration of %qD as non-member", decl);
8467 return error_mark_node;
8470 type = TREE_OPERAND (decl, 0);
8472 type = constructor_name (type);
8473 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8478 case TEMPLATE_ID_EXPR:
8480 tree fns = TREE_OPERAND (decl, 0);
8483 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8485 gcc_assert (is_overloaded_fn (dname));
8486 dname = DECL_NAME (get_first_fn (dname));
8491 case IDENTIFIER_NODE:
8492 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8495 if (C_IS_RESERVED_WORD (dname))
8497 error ("declarator-id missing; using reserved word %qD",
8499 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8501 else if (!IDENTIFIER_TYPENAME_P (dname))
8502 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8505 gcc_assert (flags == NO_SPECIAL);
8506 flags = TYPENAME_FLAG;
8507 ctor_return_type = TREE_TYPE (dname);
8508 sfk = sfk_conversion;
8509 if (is_typename_at_global_scope (dname))
8510 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8512 name = "<invalid operator>";
8529 return error_mark_node;
8534 if (id_declarator->kind == cdk_id)
8540 The declarator in a function-definition shall have the form
8541 D1 ( parameter-declaration-clause) ... */
8542 if (funcdef_flag && innermost_code != cdk_function)
8544 error ("function definition does not declare parameters");
8545 return error_mark_node;
8548 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8549 && innermost_code != cdk_function
8550 && ! (ctype && !declspecs->any_specifiers_p))
8552 error ("declaration of %qD as non-function", dname);
8553 return error_mark_node;
8557 && TREE_CODE (dname) == IDENTIFIER_NODE
8558 && UDLIT_OPER_P (dname)
8559 && innermost_code != cdk_function)
8561 error ("declaration of %qD as non-function", dname);
8562 return error_mark_node;
8565 if (dname && IDENTIFIER_OPNAME_P (dname))
8567 if (declspecs->specs[(int)ds_typedef])
8569 error ("declaration of %qD as %<typedef%>", dname);
8570 return error_mark_node;
8572 else if (decl_context == PARM || decl_context == CATCHPARM)
8574 error ("declaration of %qD as parameter", dname);
8575 return error_mark_node;
8579 /* Anything declared one level down from the top level
8580 must be one of the parameters of a function
8581 (because the body is at least two levels down). */
8583 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8584 by not allowing C++ class definitions to specify their parameters
8585 with xdecls (must be spec.d in the parmlist).
8587 Since we now wait to push a class scope until we are sure that
8588 we are in a legitimate method context, we must set oldcname
8589 explicitly (since current_class_name is not yet alive).
8591 We also want to avoid calling this a PARM if it is in a namespace. */
8593 if (decl_context == NORMAL && !toplevel_bindings_p ())
8595 cp_binding_level *b = current_binding_level;
8596 current_binding_level = b->level_chain;
8597 if (current_binding_level != 0 && toplevel_bindings_p ())
8598 decl_context = PARM;
8599 current_binding_level = b;
8603 name = decl_context == PARM ? "parameter" : "type name";
8605 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8607 error ("%<constexpr%> cannot appear in a typedef declaration");
8608 return error_mark_node;
8611 /* If there were multiple types specified in the decl-specifier-seq,
8612 issue an error message. */
8613 if (declspecs->multiple_types_p)
8615 error ("two or more data types in declaration of %qs", name);
8616 return error_mark_node;
8619 if (declspecs->conflicting_specifiers_p)
8621 error ("conflicting specifiers in declaration of %qs", name);
8622 return error_mark_node;
8625 /* Extract the basic type from the decl-specifier-seq. */
8626 type = declspecs->type;
8627 if (type == error_mark_node)
8630 type_was_error_mark_node = true;
8632 /* If the entire declaration is itself tagged as deprecated then
8633 suppress reports of deprecated items. */
8634 if (type && TREE_DEPRECATED (type)
8635 && deprecated_state != DEPRECATED_SUPPRESS)
8636 warn_deprecated_use (type, NULL_TREE);
8637 if (type && TREE_CODE (type) == TYPE_DECL)
8639 typedef_decl = type;
8640 type = TREE_TYPE (typedef_decl);
8641 if (TREE_DEPRECATED (type)
8642 && DECL_ARTIFICIAL (typedef_decl)
8643 && deprecated_state != DEPRECATED_SUPPRESS)
8644 warn_deprecated_use (type, NULL_TREE);
8646 /* No type at all: default to `int', and set DEFAULTED_INT
8647 because it was not a user-defined typedef. */
8648 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8650 /* These imply 'int'. */
8651 type = integer_type_node;
8655 explicit_int = declspecs->explicit_int_p;
8656 explicit_char = declspecs->explicit_char_p;
8659 /* See the code below that used this. */
8661 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8663 typedef_type = type;
8666 if (sfk != sfk_conversion)
8667 ctor_return_type = ctype;
8669 if (sfk != sfk_none)
8670 type = check_special_function_return_type (sfk, type,
8672 else if (type == NULL_TREE)
8678 /* We handle `main' specially here, because 'main () { }' is so
8679 common. With no options, it is allowed. With -Wreturn-type,
8680 it is a warning. It is only an error with -pedantic-errors. */
8681 is_main = (funcdef_flag
8682 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8683 && MAIN_NAME_P (dname)
8684 && ctype == NULL_TREE
8685 && in_namespace == NULL_TREE
8686 && current_namespace == global_namespace);
8688 if (type_was_error_mark_node)
8689 /* We've already issued an error, don't complain more. */;
8690 else if (in_system_header || flag_ms_extensions)
8691 /* Allow it, sigh. */;
8693 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8695 pedwarn (input_location, OPT_pedantic,
8696 "ISO C++ forbids declaration of %qs with no type", name);
8698 warning (OPT_Wreturn_type,
8699 "ISO C++ forbids declaration of %qs with no type", name);
8701 type = integer_type_node;
8706 if (explicit_int128)
8708 if (int128_integer_type_node == NULL_TREE)
8710 error ("%<__int128%> is not supported by this target");
8711 explicit_int128 = false;
8713 else if (pedantic && ! in_system_header)
8714 pedwarn (input_location, OPT_pedantic,
8715 "ISO C++ does not support %<__int128%> for %qs", name);
8718 /* Now process the modifiers that were specified
8719 and check for invalid combinations. */
8721 /* Long double is a special combination. */
8722 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8725 type = cp_build_qualified_type (long_double_type_node,
8726 cp_type_quals (type));
8729 /* Check all other uses of type modifiers. */
8731 if (unsigned_p || signed_p || long_p || short_p)
8735 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8736 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8737 else if (signed_p && unsigned_p)
8738 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8739 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8740 error ("%<long long%> invalid for %qs", name);
8741 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8742 error ("%<long%> invalid for %qs", name);
8743 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8744 error ("%<short%> invalid for %qs", name);
8745 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8746 error ("%<long%> or %<short%> invalid for %qs", name);
8747 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8748 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8749 else if ((long_p || short_p) && explicit_char)
8750 error ("%<long%> or %<short%> specified with char for %qs", name);
8751 else if (long_p && short_p)
8752 error ("%<long%> and %<short%> specified together for %qs", name);
8753 else if (type == char16_type_node || type == char32_type_node)
8755 if (signed_p || unsigned_p)
8756 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8757 else if (short_p || long_p)
8758 error ("%<short%> or %<long%> invalid for %qs", name);
8763 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8765 pedwarn (input_location, OPT_pedantic,
8766 "long, short, signed or unsigned used invalidly for %qs",
8768 if (flag_pedantic_errors)
8773 /* Discard the type modifiers if they are invalid. */
8784 /* Decide whether an integer type is signed or not.
8785 Optionally treat bitfields as signed by default. */
8789 It is implementation-defined whether a plain (neither
8790 explicitly signed or unsigned) char, short, int, or long
8791 bit-field is signed or unsigned.
8793 Naturally, we extend this to long long as well. Note that
8794 this does not include wchar_t. */
8795 || (bitfield && !flag_signed_bitfields
8797 /* A typedef for plain `int' without `signed' can be
8798 controlled just like plain `int', but a typedef for
8799 `signed int' cannot be so controlled. */
8801 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8802 && TREE_CODE (type) == INTEGER_TYPE
8803 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8805 if (explicit_int128)
8806 type = int128_unsigned_type_node;
8808 type = long_long_unsigned_type_node;
8810 type = long_unsigned_type_node;
8812 type = short_unsigned_type_node;
8813 else if (type == char_type_node)
8814 type = unsigned_char_type_node;
8815 else if (typedef_decl)
8816 type = unsigned_type_for (type);
8818 type = unsigned_type_node;
8820 else if (signed_p && type == char_type_node)
8821 type = signed_char_type_node;
8822 else if (explicit_int128)
8823 type = int128_integer_type_node;
8825 type = long_long_integer_type_node;
8827 type = long_integer_type_node;
8829 type = short_integer_type_node;
8831 if (declspecs->specs[(int)ds_complex])
8833 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8834 error ("complex invalid for %qs", name);
8835 /* If we just have "complex", it is equivalent to
8836 "complex double", but if any modifiers at all are specified it is
8837 the complex form of TYPE. E.g, "complex short" is
8838 "complex short int". */
8839 else if (defaulted_int && ! longlong && ! explicit_int128
8840 && ! (long_p || short_p || signed_p || unsigned_p))
8841 type = complex_double_type_node;
8842 else if (type == integer_type_node)
8843 type = complex_integer_type_node;
8844 else if (type == float_type_node)
8845 type = complex_float_type_node;
8846 else if (type == double_type_node)
8847 type = complex_double_type_node;
8848 else if (type == long_double_type_node)
8849 type = complex_long_double_type_node;
8851 type = build_complex_type (type);
8854 type_quals = TYPE_UNQUALIFIED;
8855 if (declspecs->specs[(int)ds_const])
8856 type_quals |= TYPE_QUAL_CONST;
8857 if (declspecs->specs[(int)ds_volatile])
8858 type_quals |= TYPE_QUAL_VOLATILE;
8859 if (declspecs->specs[(int)ds_restrict])
8860 type_quals |= TYPE_QUAL_RESTRICT;
8861 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8862 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8865 type_quals |= cp_type_quals (type);
8866 type = cp_build_qualified_type_real
8867 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8868 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8869 /* We might have ignored or rejected some of the qualifiers. */
8870 type_quals = cp_type_quals (type);
8873 inlinep = !! declspecs->specs[(int)ds_inline];
8874 virtualp = !! declspecs->specs[(int)ds_virtual];
8875 explicitp = !! declspecs->specs[(int)ds_explicit];
8877 storage_class = declspecs->storage_class;
8878 if (storage_class == sc_static)
8879 staticp = 1 + (decl_context == FIELD);
8881 if (virtualp && staticp == 2)
8883 error ("member %qD cannot be declared both virtual and static", dname);
8884 storage_class = sc_none;
8887 friendp = !! declspecs->specs[(int)ds_friend];
8889 if (dependent_name && !friendp)
8891 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8892 return error_mark_node;
8895 /* Issue errors about use of storage classes for parameters. */
8896 if (decl_context == PARM)
8898 if (declspecs->specs[(int)ds_typedef])
8900 error ("typedef declaration invalid in parameter declaration");
8901 return error_mark_node;
8903 else if (template_parm_flag && storage_class != sc_none)
8905 error ("storage class specified for template parameter %qs", name);
8906 return error_mark_node;
8908 else if (storage_class == sc_static
8909 || storage_class == sc_extern
8911 error ("storage class specifiers invalid in parameter declarations");
8913 /* Function parameters cannot be constexpr. If we saw one, moan
8914 and pretend it wasn't there. */
8917 error ("a parameter cannot be declared %<constexpr%>");
8922 /* Give error if `virtual' is used outside of class declaration. */
8924 && (current_class_name == NULL_TREE || decl_context != FIELD))
8926 error ("%<virtual%> outside class declaration");
8930 /* Static anonymous unions are dealt with here. */
8931 if (staticp && decl_context == TYPENAME
8933 && ANON_AGGR_TYPE_P (declspecs->type))
8934 decl_context = FIELD;
8936 /* Warn about storage classes that are invalid for certain
8937 kinds of declarations (parameters, typenames, etc.). */
8940 && storage_class != sc_extern
8941 && storage_class != sc_static)
8942 || declspecs->specs[(int)ds_typedef]))
8944 error ("multiple storage classes in declaration of %qs", name);
8947 if (decl_context != NORMAL
8948 && ((storage_class != sc_none
8949 && storage_class != sc_mutable)
8952 if ((decl_context == PARM || decl_context == CATCHPARM)
8953 && (storage_class == sc_register
8954 || storage_class == sc_auto))
8956 else if (declspecs->specs[(int)ds_typedef])
8958 else if (decl_context == FIELD
8959 /* C++ allows static class elements. */
8960 && storage_class == sc_static)
8961 /* C++ also allows inlines and signed and unsigned elements,
8962 but in those cases we don't come in here. */
8966 if (decl_context == FIELD)
8967 error ("storage class specified for %qs", name);
8970 if (decl_context == PARM || decl_context == CATCHPARM)
8971 error ("storage class specified for parameter %qs", name);
8973 error ("storage class specified for typename");
8975 if (storage_class == sc_register
8976 || storage_class == sc_auto
8977 || storage_class == sc_extern
8979 storage_class = sc_none;
8982 else if (storage_class == sc_extern && funcdef_flag
8983 && ! toplevel_bindings_p ())
8984 error ("nested function %qs declared %<extern%>", name);
8985 else if (toplevel_bindings_p ())
8987 if (storage_class == sc_auto)
8988 error ("top-level declaration of %qs specifies %<auto%>", name);
8991 && storage_class != sc_extern
8992 && storage_class != sc_static)
8994 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8999 if (storage_class && friendp)
9001 error ("storage class specifiers invalid in friend function declarations");
9002 storage_class = sc_none;
9007 unqualified_id = NULL_TREE;
9010 unqualified_id = id_declarator->u.id.unqualified_name;
9011 switch (TREE_CODE (unqualified_id))
9014 unqualified_id = TREE_OPERAND (unqualified_id, 0);
9015 if (TYPE_P (unqualified_id))
9016 unqualified_id = constructor_name (unqualified_id);
9019 case IDENTIFIER_NODE:
9020 case TEMPLATE_ID_EXPR:
9028 /* Determine the type of the entity declared by recurring on the
9030 for (; declarator; declarator = declarator->declarator)
9032 const cp_declarator *inner_declarator;
9035 if (type == error_mark_node)
9036 return error_mark_node;
9038 attrs = declarator->attributes;
9044 if (declarator == NULL || declarator->kind == cdk_id)
9045 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9046 if (declarator->kind == cdk_function)
9047 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9048 if (declarator->kind == cdk_array)
9049 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9050 returned_attrs = decl_attributes (&type,
9051 chainon (returned_attrs, attrs),
9055 if (declarator->kind == cdk_id)
9058 inner_declarator = declarator->declarator;
9060 switch (declarator->kind)
9063 type = create_array_type_for_decl (dname, type,
9064 declarator->u.array.bounds);
9072 /* Declaring a function type.
9073 Make sure we have a valid type for the function to return. */
9075 if (type_quals != TYPE_UNQUALIFIED)
9077 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9078 warning (OPT_Wignored_qualifiers,
9079 "type qualifiers ignored on function return type");
9080 /* We now know that the TYPE_QUALS don't apply to the
9081 decl, but to its return type. */
9082 type_quals = TYPE_UNQUALIFIED;
9084 errmsg = targetm.invalid_return_type (type);
9088 type = integer_type_node;
9091 /* Error about some types functions can't return. */
9093 if (TREE_CODE (type) == FUNCTION_TYPE)
9095 error ("%qs declared as function returning a function", name);
9096 return error_mark_node;
9098 if (TREE_CODE (type) == ARRAY_TYPE)
9100 error ("%qs declared as function returning an array", name);
9101 return error_mark_node;
9104 /* Pick up type qualifiers which should be applied to `this'. */
9105 memfn_quals = declarator->u.function.qualifiers;
9106 /* Pick up virt-specifiers. */
9107 virt_specifiers = declarator->u.function.virt_specifiers;
9108 /* Pick up the exception specifications. */
9109 raises = declarator->u.function.exception_specification;
9110 /* If the exception-specification is ill-formed, let's pretend
9111 there wasn't one. */
9112 if (raises == error_mark_node)
9115 /* Say it's a definition only for the CALL_EXPR
9116 closest to the identifier. */
9117 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9119 /* Handle a late-specified return type. */
9122 if (type_uses_auto (type))
9124 if (!declarator->u.function.late_return_type)
9126 error ("%qs function uses %<auto%> type specifier without"
9127 " late return type", name);
9128 return error_mark_node;
9130 else if (!is_auto (type))
9132 error ("%qs function with late return type has"
9133 " %qT as its type rather than plain %<auto%>",
9135 return error_mark_node;
9138 else if (declarator->u.function.late_return_type)
9140 error ("%qs function with late return type not declared"
9141 " with %<auto%> type specifier", name);
9142 return error_mark_node;
9145 type = splice_late_return_type
9146 (type, declarator->u.function.late_return_type);
9147 if (type == error_mark_node)
9148 return error_mark_node;
9150 if (ctype == NULL_TREE
9151 && decl_context == FIELD
9153 && (friendp == 0 || dname == current_class_name))
9154 ctype = current_class_type;
9156 if (ctype && (sfk == sfk_constructor
9157 || sfk == sfk_destructor))
9159 /* We are within a class's scope. If our declarator name
9160 is the same as the class name, and we are defining
9161 a function, then it is a constructor/destructor, and
9162 therefore returns a void type. */
9164 /* ISO C++ 12.4/2. A destructor may not be declared
9165 const or volatile. A destructor may not be
9168 ISO C++ 12.1. A constructor may not be declared
9169 const or volatile. A constructor may not be
9170 virtual. A constructor may not be static. */
9172 error ((flags == DTOR_FLAG)
9173 ? G_("destructor cannot be static member function")
9174 : G_("constructor cannot be static member function"));
9177 error ((flags == DTOR_FLAG)
9178 ? G_("destructors may not be cv-qualified")
9179 : G_("constructors may not be cv-qualified"));
9180 memfn_quals = TYPE_UNQUALIFIED;
9183 if (decl_context == FIELD
9184 && !member_function_or_else (ctype,
9187 return error_mark_node;
9189 if (flags != DTOR_FLAG)
9191 /* It's a constructor. */
9196 permerror (input_location, "constructors cannot be declared virtual");
9199 if (decl_context == FIELD
9200 && sfk != sfk_constructor)
9201 return error_mark_node;
9203 if (decl_context == FIELD)
9209 error ("can%'t initialize friend function %qs", name);
9212 /* Cannot be both friend and virtual. */
9213 error ("virtual functions cannot be friends");
9216 if (decl_context == NORMAL)
9217 error ("friend declaration not in class definition");
9218 if (current_function_decl && funcdef_flag)
9219 error ("can%'t define friend function %qs in a local "
9223 else if (ctype && sfk == sfk_conversion)
9227 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9232 arg_types = grokparms (declarator->u.function.parameters,
9235 if (inner_declarator
9236 && inner_declarator->kind == cdk_id
9237 && inner_declarator->u.id.sfk == sfk_destructor
9238 && arg_types != void_list_node)
9240 error ("destructors may not have parameters");
9241 arg_types = void_list_node;
9245 type = build_function_type (type, arg_types);
9252 /* Filter out pointers-to-references and references-to-references.
9253 We can get these if a TYPE_DECL is used. */
9255 if (TREE_CODE (type) == REFERENCE_TYPE)
9257 if (declarator->kind != cdk_reference)
9259 error ("cannot declare pointer to %q#T", type);
9260 type = TREE_TYPE (type);
9263 /* In C++0x, we allow reference to reference declarations
9264 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9265 and template type arguments [14.3.1/4 temp.arg.type]. The
9266 check for direct reference to reference declarations, which
9267 are still forbidden, occurs below. Reasoning behind the change
9268 can be found in DR106, DR540, and the rvalue reference
9270 else if (cxx_dialect == cxx98)
9272 error ("cannot declare reference to %q#T", type);
9273 type = TREE_TYPE (type);
9276 else if (VOID_TYPE_P (type))
9278 if (declarator->kind == cdk_reference)
9279 error ("cannot declare reference to %q#T", type);
9280 else if (declarator->kind == cdk_ptrmem)
9281 error ("cannot declare pointer to %q#T member", type);
9284 /* We now know that the TYPE_QUALS don't apply to the decl,
9285 but to the target of the pointer. */
9286 type_quals = TYPE_UNQUALIFIED;
9288 if (declarator->kind == cdk_ptrmem
9289 && (TREE_CODE (type) == FUNCTION_TYPE
9290 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9292 memfn_quals |= type_memfn_quals (type);
9293 type = build_memfn_type (type,
9294 declarator->u.pointer.class_type,
9296 if (type == error_mark_node)
9297 return error_mark_node;
9298 memfn_quals = TYPE_UNQUALIFIED;
9301 if (TREE_CODE (type) == FUNCTION_TYPE
9302 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9303 error (declarator->kind == cdk_reference
9304 ? G_("cannot declare reference to qualified function type %qT")
9305 : G_("cannot declare pointer to qualified function type %qT"),
9308 /* When the pointed-to type involves components of variable size,
9309 care must be taken to ensure that the size evaluation code is
9310 emitted early enough to dominate all the possible later uses
9311 and late enough for the variables on which it depends to have
9314 This is expected to happen automatically when the pointed-to
9315 type has a name/declaration of it's own, but special attention
9316 is required if the type is anonymous.
9318 We handle the NORMAL and FIELD contexts here by inserting a
9319 dummy statement that just evaluates the size at a safe point
9320 and ensures it is not deferred until e.g. within a deeper
9321 conditional context (c++/43555).
9323 We expect nothing to be needed here for PARM or TYPENAME.
9324 Evaluating the size at this point for TYPENAME would
9325 actually be incorrect, as we might be in the middle of an
9326 expression with side effects on the pointed-to type size
9327 "arguments" prior to the pointer declaration point and the
9328 size evaluation could end up prior to the side effects. */
9330 if (!TYPE_NAME (type)
9331 && (decl_context == NORMAL || decl_context == FIELD)
9332 && at_function_scope_p ()
9333 && variably_modified_type_p (type, NULL_TREE))
9335 /* First break out any side-effects. */
9336 stabilize_vla_size (TYPE_SIZE (type));
9337 /* And then force evaluation of the SAVE_EXPR. */
9338 finish_expr_stmt (TYPE_SIZE (type));
9341 if (declarator->kind == cdk_reference)
9343 /* In C++0x, the type we are creating a reference to might be
9344 a typedef which is itself a reference type. In that case,
9345 we follow the reference collapsing rules in
9346 [7.1.3/8 dcl.typedef] to create the final reference type:
9348 "If a typedef TD names a type that is a reference to a type
9349 T, an attempt to create the type 'lvalue reference to cv TD'
9350 creates the type 'lvalue reference to T,' while an attempt
9351 to create the type "rvalue reference to cv TD' creates the
9354 if (VOID_TYPE_P (type))
9355 /* We already gave an error. */;
9356 else if (TREE_CODE (type) == REFERENCE_TYPE)
9358 if (declarator->u.reference.rvalue_ref)
9359 /* Leave type alone. */;
9361 type = cp_build_reference_type (TREE_TYPE (type), false);
9364 type = cp_build_reference_type
9365 (type, declarator->u.reference.rvalue_ref);
9367 /* In C++0x, we need this check for direct reference to
9368 reference declarations, which are forbidden by
9369 [8.3.2/5 dcl.ref]. Reference to reference declarations
9370 are only allowed indirectly through typedefs and template
9371 type arguments. Example:
9373 void foo(int & &); // invalid ref-to-ref decl
9375 typedef int & int_ref;
9376 void foo(int_ref &); // valid ref-to-ref decl
9378 if (inner_declarator && inner_declarator->kind == cdk_reference)
9379 error ("cannot declare reference to %q#T, which is not "
9380 "a typedef or a template type argument", type);
9382 else if (TREE_CODE (type) == METHOD_TYPE)
9383 type = build_ptrmemfunc_type (build_pointer_type (type));
9384 else if (declarator->kind == cdk_ptrmem)
9386 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9388 if (declarator->u.pointer.class_type == error_mark_node)
9389 /* We will already have complained. */
9390 type = error_mark_node;
9392 type = build_ptrmem_type (declarator->u.pointer.class_type,
9396 type = build_pointer_type (type);
9398 /* Process a list of type modifier keywords (such as
9399 const or volatile) that were given inside the `*' or `&'. */
9401 if (declarator->u.pointer.qualifiers)
9404 = cp_build_qualified_type (type,
9405 declarator->u.pointer.qualifiers);
9406 type_quals = cp_type_quals (type);
9419 /* We need to stabilize side-effects in VLA sizes for regular array
9420 declarations too, not just pointers to arrays. */
9421 if (type != error_mark_node && !TYPE_NAME (type)
9422 && (decl_context == NORMAL || decl_context == FIELD)
9423 && at_function_scope_p ()
9424 && variably_modified_type_p (type, NULL_TREE))
9425 stabilize_vla_size (TYPE_SIZE (type));
9427 /* A `constexpr' specifier used in an object declaration declares
9428 the object as `const'. */
9429 if (constexpr_p && innermost_code != cdk_function)
9431 if (type_quals & TYPE_QUAL_CONST)
9432 error ("both %<const%> and %<constexpr%> cannot be used here");
9433 if (type_quals & TYPE_QUAL_VOLATILE)
9434 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9435 if (TREE_CODE (type) != REFERENCE_TYPE)
9437 type_quals |= TYPE_QUAL_CONST;
9438 type = cp_build_qualified_type (type, type_quals);
9442 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9443 && TREE_CODE (type) != FUNCTION_TYPE
9444 && TREE_CODE (type) != METHOD_TYPE)
9446 error ("template-id %qD used as a declarator",
9448 unqualified_id = dname;
9451 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9452 qualified with a class-name, turn it into a METHOD_TYPE, unless
9453 we know that the function is static. We take advantage of this
9454 opportunity to do other processing that pertains to entities
9455 explicitly declared to be class members. Note that if DECLARATOR
9456 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9457 would not have exited the loop above. */
9459 && declarator->u.id.qualifying_scope
9460 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9464 ctype = declarator->u.id.qualifying_scope;
9465 ctype = TYPE_MAIN_VARIANT (ctype);
9467 while (t != NULL_TREE && CLASS_TYPE_P (t))
9469 /* You're supposed to have one `template <...>' for every
9470 template class, but you don't need one for a full
9471 specialization. For example:
9473 template <class T> struct S{};
9474 template <> struct S<int> { void f(); };
9475 void S<int>::f () {}
9477 is correct; there shouldn't be a `template <>' for the
9478 definition of `S<int>::f'. */
9479 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9480 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9481 /* T is an explicit (not partial) specialization. All
9482 containing classes must therefore also be explicitly
9485 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9486 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9487 template_count += 1;
9489 t = TYPE_MAIN_DECL (t);
9490 t = DECL_CONTEXT (t);
9493 if (ctype == current_class_type)
9497 permerror (input_location, "member functions are implicitly friends of their class");
9501 permerror (declarator->id_loc,
9502 "extra qualification %<%T::%> on member %qs",
9505 else if (/* If the qualifying type is already complete, then we
9506 can skip the following checks. */
9507 !COMPLETE_TYPE_P (ctype)
9508 && (/* If the function is being defined, then
9509 qualifying type must certainly be complete. */
9511 /* A friend declaration of "T::f" is OK, even if
9512 "T" is a template parameter. But, if this
9513 function is not a friend, the qualifying type
9515 || (!friendp && !CLASS_TYPE_P (ctype))
9516 /* For a declaration, the type need not be
9517 complete, if either it is dependent (since there
9518 is no meaningful definition of complete in that
9519 case) or the qualifying class is currently being
9521 || !(dependent_type_p (ctype)
9522 || currently_open_class (ctype)))
9523 /* Check that the qualifying type is complete. */
9524 && !complete_type_or_else (ctype, NULL_TREE))
9525 return error_mark_node;
9526 else if (TREE_CODE (type) == FUNCTION_TYPE)
9528 if (current_class_type
9529 && (!friendp || funcdef_flag))
9532 ? G_("cannot define member function %<%T::%s%> "
9534 : G_("cannot declare member function %<%T::%s%> "
9536 ctype, name, current_class_type);
9537 return error_mark_node;
9540 else if (declspecs->specs[(int)ds_typedef]
9541 && current_class_type)
9543 error ("cannot declare member %<%T::%s%> within %qT",
9544 ctype, name, current_class_type);
9545 return error_mark_node;
9549 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9550 ctype = current_class_type;
9552 /* Now TYPE has the actual type. */
9557 *attrlist = chainon (returned_attrs, *attrlist);
9559 attrlist = &returned_attrs;
9562 /* Handle parameter packs. */
9563 if (parameter_pack_p)
9565 if (decl_context == PARM)
9566 /* Turn the type into a pack expansion.*/
9567 type = make_pack_expansion (type);
9569 error ("non-parameter %qs cannot be a parameter pack", name);
9572 /* Did array size calculations overflow? */
9574 if (TREE_CODE (type) == ARRAY_TYPE
9575 && COMPLETE_TYPE_P (type)
9576 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9577 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9579 error ("size of array %qs is too large", name);
9580 /* If we proceed with the array type as it is, we'll eventually
9581 crash in tree_low_cst(). */
9582 type = error_mark_node;
9585 if ((decl_context == FIELD || decl_context == PARM)
9586 && !processing_template_decl
9587 && variably_modified_type_p (type, NULL_TREE))
9589 if (decl_context == FIELD)
9590 error ("data member may not have variably modified type %qT", type);
9592 error ("parameter may not have variably modified type %qT", type);
9593 type = error_mark_node;
9596 if (explicitp == 1 || (explicitp && friendp))
9598 /* [dcl.fct.spec] The explicit specifier shall only be used in
9599 declarations of constructors within a class definition. */
9600 error ("only declarations of constructors can be %<explicit%>");
9604 if (storage_class == sc_mutable)
9606 if (decl_context != FIELD || friendp)
9608 error ("non-member %qs cannot be declared %<mutable%>", name);
9609 storage_class = sc_none;
9611 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9613 error ("non-object member %qs cannot be declared %<mutable%>", name);
9614 storage_class = sc_none;
9616 else if (TREE_CODE (type) == FUNCTION_TYPE
9617 || TREE_CODE (type) == METHOD_TYPE)
9619 error ("function %qs cannot be declared %<mutable%>", name);
9620 storage_class = sc_none;
9624 error ("static %qs cannot be declared %<mutable%>", name);
9625 storage_class = sc_none;
9627 else if (type_quals & TYPE_QUAL_CONST)
9629 error ("const %qs cannot be declared %<mutable%>", name);
9630 storage_class = sc_none;
9632 else if (TREE_CODE (type) == REFERENCE_TYPE)
9634 permerror (input_location, "reference %qs cannot be declared "
9635 "%<mutable%>", name);
9636 storage_class = sc_none;
9640 /* If this is declaring a typedef name, return a TYPE_DECL. */
9641 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9645 /* Note that the grammar rejects storage classes
9646 in typenames, fields or parameters. */
9647 if (current_lang_name == lang_name_java)
9648 TYPE_FOR_JAVA (type) = 1;
9650 /* This declaration:
9652 typedef void f(int) const;
9654 declares a function type which is not a member of any
9655 particular class, but which is cv-qualified; for
9656 example "f S::*" declares a pointer to a const-qualified
9657 member function of S. We record the cv-qualification in the
9659 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9661 type = apply_memfn_quals (type, memfn_quals);
9663 /* We have now dealt with these qualifiers. */
9664 memfn_quals = TYPE_UNQUALIFIED;
9667 if (type_uses_auto (type))
9669 error ("typedef declared %<auto%>");
9670 type = error_mark_node;
9673 if (decl_context == FIELD)
9674 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9676 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9677 if (id_declarator && declarator->u.id.qualifying_scope) {
9678 error_at (DECL_SOURCE_LOCATION (decl),
9679 "typedef name may not be a nested-name-specifier");
9680 TREE_TYPE (decl) = error_mark_node;
9683 if (decl_context != FIELD)
9685 if (!current_function_decl)
9686 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9687 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9688 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9689 (current_function_decl)))
9690 /* The TYPE_DECL is "abstract" because there will be
9691 clones of this constructor/destructor, and there will
9692 be copies of this TYPE_DECL generated in those
9694 DECL_ABSTRACT (decl) = 1;
9696 else if (constructor_name_p (unqualified_id, current_class_type))
9697 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9698 "as enclosing class",
9701 /* If the user declares "typedef struct {...} foo" then the
9702 struct will have an anonymous name. Fill that name in now.
9703 Nothing can refer to it, so nothing needs know about the name
9705 if (type != error_mark_node
9708 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9709 && TYPE_ANONYMOUS_P (type)
9710 && declspecs->type_definition_p
9711 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9715 /* Replace the anonymous name with the real name everywhere. */
9716 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9718 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9719 /* We do not rename the debug info representing the
9720 anonymous tagged type because the standard says in
9721 [dcl.typedef] that the naming applies only for
9722 linkage purposes. */
9723 /*debug_hooks->set_name (t, decl);*/
9724 TYPE_NAME (t) = decl;
9727 if (TYPE_LANG_SPECIFIC (type))
9728 TYPE_WAS_ANONYMOUS (type) = 1;
9730 /* If this is a typedef within a template class, the nested
9731 type is a (non-primary) template. The name for the
9732 template needs updating as well. */
9733 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9734 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9735 = TYPE_IDENTIFIER (type);
9737 /* Adjust linkage now that we aren't anonymous anymore. */
9738 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9739 determine_visibility (TYPE_MAIN_DECL (type));
9741 /* FIXME remangle member functions; member functions of a
9742 type with external linkage have external linkage. */
9746 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9747 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9749 bad_specifiers (decl, BSP_TYPE, virtualp,
9750 memfn_quals != TYPE_UNQUALIFIED,
9751 inlinep, friendp, raises != NULL_TREE);
9753 if (declspecs->specs[(int)ds_alias])
9754 /* Acknowledge that this was written:
9755 `using analias = atype;'. */
9756 TYPE_DECL_ALIAS_P (decl) = 1;
9761 /* Detect the case of an array type of unspecified size
9762 which came, as such, direct from a typedef name.
9763 We must copy the type, so that the array's domain can be
9764 individually set by the object's initializer. */
9766 if (type && typedef_type
9767 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9768 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9769 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9771 /* Detect where we're using a typedef of function type to declare a
9772 function. PARMS will not be set, so we must create it now. */
9774 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9776 tree decls = NULL_TREE;
9779 for (args = TYPE_ARG_TYPES (type);
9780 args && args != void_list_node;
9781 args = TREE_CHAIN (args))
9783 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9785 DECL_CHAIN (decl) = decls;
9789 parms = nreverse (decls);
9791 if (decl_context != TYPENAME)
9793 /* A cv-qualifier-seq shall only be part of the function type
9794 for a non-static member function. [8.3.5/4 dcl.fct] */
9795 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9796 && (current_class_type == NULL_TREE || staticp) )
9799 ? G_("qualified function types cannot be used to "
9800 "declare static member functions")
9801 : G_("qualified function types cannot be used to "
9802 "declare free functions"));
9803 type = TYPE_MAIN_VARIANT (type);
9806 /* The qualifiers on the function type become the qualifiers on
9807 the non-static member function. */
9808 memfn_quals |= type_memfn_quals (type);
9809 type_quals = TYPE_UNQUALIFIED;
9813 /* If this is a type name (such as, in a cast or sizeof),
9814 compute the type and return it now. */
9816 if (decl_context == TYPENAME)
9818 /* Note that the grammar rejects storage classes
9819 in typenames, fields or parameters. */
9820 if (type_quals != TYPE_UNQUALIFIED)
9821 type_quals = TYPE_UNQUALIFIED;
9823 /* Special case: "friend class foo" looks like a TYPENAME context. */
9826 if (type_quals != TYPE_UNQUALIFIED)
9828 error ("type qualifiers specified for friend class declaration");
9829 type_quals = TYPE_UNQUALIFIED;
9833 error ("%<inline%> specified for friend class declaration");
9839 /* Don't allow friend declaration without a class-key. */
9840 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9841 permerror (input_location, "template parameters cannot be friends");
9842 else if (TREE_CODE (type) == TYPENAME_TYPE)
9843 permerror (input_location, "friend declaration requires class-key, "
9844 "i.e. %<friend class %T::%D%>",
9845 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9847 permerror (input_location, "friend declaration requires class-key, "
9848 "i.e. %<friend %#T%>",
9852 /* Only try to do this stuff if we didn't already give up. */
9853 if (type != integer_type_node)
9855 /* A friendly class? */
9856 if (current_class_type)
9857 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9860 error ("trying to make class %qT a friend of global scope",
9863 type = void_type_node;
9866 else if (memfn_quals)
9868 if (ctype == NULL_TREE
9869 && TREE_CODE (type) == METHOD_TYPE)
9870 ctype = TYPE_METHOD_BASETYPE (type);
9873 type = build_memfn_type (type, ctype, memfn_quals);
9874 /* Core issue #547: need to allow this in template type args. */
9875 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9876 type = apply_memfn_quals (type, memfn_quals);
9878 error ("invalid qualifiers on non-member function type");
9883 else if (unqualified_id == NULL_TREE && decl_context != PARM
9884 && decl_context != CATCHPARM
9885 && TREE_CODE (type) != UNION_TYPE
9888 error ("abstract declarator %qT used as declaration", type);
9889 return error_mark_node;
9892 /* Only functions may be declared using an operator-function-id. */
9894 && IDENTIFIER_OPNAME_P (unqualified_id)
9895 && TREE_CODE (type) != FUNCTION_TYPE
9896 && TREE_CODE (type) != METHOD_TYPE)
9898 error ("declaration of %qD as non-function", unqualified_id);
9899 return error_mark_node;
9902 /* We don't check parameter types here because we can emit a better
9903 error message later. */
9904 if (decl_context != PARM)
9906 type = check_var_type (unqualified_id, type);
9907 if (type == error_mark_node)
9908 return error_mark_node;
9911 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9912 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9914 if (decl_context == PARM || decl_context == CATCHPARM)
9916 if (ctype || in_namespace)
9917 error ("cannot use %<::%> in parameter declaration");
9919 if (type_uses_auto (type))
9921 error ("parameter declared %<auto%>");
9922 type = error_mark_node;
9925 /* A parameter declared as an array of T is really a pointer to T.
9926 One declared as a function is really a pointer to a function.
9927 One declared as a member is really a pointer to member. */
9929 if (TREE_CODE (type) == ARRAY_TYPE)
9931 /* Transfer const-ness of array into that of type pointed to. */
9932 type = build_pointer_type (TREE_TYPE (type));
9933 type_quals = TYPE_UNQUALIFIED;
9935 else if (TREE_CODE (type) == FUNCTION_TYPE)
9936 type = build_pointer_type (type);
9939 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9940 && !NEW_DELETE_OPNAME_P (unqualified_id))
9942 cp_cv_quals real_quals = memfn_quals;
9943 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9944 real_quals |= TYPE_QUAL_CONST;
9945 type = build_memfn_type (type, ctype, real_quals);
9951 if (decl_context == PARM)
9953 decl = cp_build_parm_decl (unqualified_id, type);
9955 bad_specifiers (decl, BSP_PARM, virtualp,
9956 memfn_quals != TYPE_UNQUALIFIED,
9957 inlinep, friendp, raises != NULL_TREE);
9959 else if (decl_context == FIELD)
9961 /* The C99 flexible array extension. */
9962 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9963 && TYPE_DOMAIN (type) == NULL_TREE)
9965 tree itype = compute_array_index_type (dname, integer_zero_node,
9966 tf_warning_or_error);
9967 type = build_cplus_array_type (TREE_TYPE (type), itype);
9970 if (type == error_mark_node)
9972 /* Happens when declaring arrays of sizes which
9973 are error_mark_node, for example. */
9976 else if (in_namespace && !friendp)
9978 /* Something like struct S { int N::j; }; */
9979 error ("invalid use of %<::%>");
9980 return error_mark_node;
9982 else if (TREE_CODE (type) == FUNCTION_TYPE
9983 || TREE_CODE (type) == METHOD_TYPE)
9986 tree function_context;
9990 /* This should never happen in pure C++ (the check
9991 could be an assert). It could happen in
9992 Objective-C++ if someone writes invalid code that
9993 uses a function declaration for an instance
9994 variable or property (instance variables and
9995 properties are parsed as FIELD_DECLs, but they are
9996 part of an Objective-C class, not a C++ class).
9997 That code is invalid and is caught by this
10001 error ("declaration of function %qD in invalid context",
10003 return error_mark_node;
10006 /* ``A union may [ ... ] not [ have ] virtual functions.''
10008 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
10010 error ("function %qD declared virtual inside a union",
10012 return error_mark_node;
10015 if (NEW_DELETE_OPNAME_P (unqualified_id))
10019 error ("%qD cannot be declared virtual, since it "
10020 "is always static",
10027 /* Check that the name used for a destructor makes sense. */
10028 if (sfk == sfk_destructor)
10030 tree uqname = id_declarator->u.id.unqualified_name;
10034 gcc_assert (friendp);
10035 error ("expected qualified name in friend declaration "
10036 "for destructor %qD", uqname);
10037 return error_mark_node;
10040 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10042 error ("declaration of %qD as member of %qT",
10044 return error_mark_node;
10048 error ("a destructor cannot be %<constexpr%>");
10049 return error_mark_node;
10052 else if (sfk == sfk_constructor && friendp && !ctype)
10054 error ("expected qualified name in friend declaration "
10055 "for constructor %qD",
10056 id_declarator->u.id.unqualified_name);
10057 return error_mark_node;
10060 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10061 function_context = (ctype != NULL_TREE) ?
10062 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10063 publicp = (! friendp || ! staticp)
10064 && function_context == NULL_TREE;
10065 decl = grokfndecl (ctype, type,
10066 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10067 ? unqualified_id : dname,
10070 virtualp, flags, memfn_quals, raises,
10071 friendp ? -1 : 0, friendp, publicp,
10072 inlinep | (2 * constexpr_p),
10074 funcdef_flag, template_count, in_namespace,
10075 attrlist, declarator->id_loc);
10076 decl = set_virt_specifiers (decl, virt_specifiers);
10077 if (decl == NULL_TREE)
10078 return error_mark_node;
10080 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10081 /* The decl and setting of decl_attr is also turned off. */
10082 decl = build_decl_attribute_variant (decl, decl_attr);
10085 /* [class.conv.ctor]
10087 A constructor declared without the function-specifier
10088 explicit that can be called with a single parameter
10089 specifies a conversion from the type of its first
10090 parameter to the type of its class. Such a constructor
10091 is called a converting constructor. */
10092 if (explicitp == 2)
10093 DECL_NONCONVERTING_P (decl) = 1;
10095 else if (!staticp && !dependent_type_p (type)
10096 && !COMPLETE_TYPE_P (complete_type (type))
10097 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10099 if (unqualified_id)
10100 error ("field %qD has incomplete type", unqualified_id);
10102 error ("name %qT has incomplete type", type);
10104 /* If we're instantiating a template, tell them which
10105 instantiation made the field's type be incomplete. */
10106 if (current_class_type
10107 && TYPE_NAME (current_class_type)
10108 && IDENTIFIER_TEMPLATE (current_class_name)
10110 && declspecs->type == type)
10111 error (" in instantiation of template %qT",
10112 current_class_type);
10114 return error_mark_node;
10120 error ("%qE is neither function nor member function; "
10121 "cannot be declared friend", unqualified_id);
10129 /* Friends are treated specially. */
10130 if (ctype == current_class_type)
10131 ; /* We already issued a permerror. */
10132 else if (decl && DECL_NAME (decl))
10134 if (template_class_depth (current_class_type) == 0)
10136 decl = check_explicit_specialization
10137 (unqualified_id, decl, template_count,
10138 2 * funcdef_flag + 4);
10139 if (decl == error_mark_node)
10140 return error_mark_node;
10143 decl = do_friend (ctype, unqualified_id, decl,
10149 return error_mark_node;
10152 /* Structure field. It may not be a function, except for C++. */
10154 if (decl == NULL_TREE)
10158 /* C++ allows static class members. All other work
10159 for this is done by grokfield. */
10160 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10161 set_linkage_for_static_data_member (decl);
10162 /* Even if there is an in-class initialization, DECL
10163 is considered undefined until an out-of-class
10164 definition is provided. */
10165 DECL_EXTERNAL (decl) = 1;
10168 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10170 if (constexpr_p && !initialized)
10172 error ("constexpr static data member %qD must have an "
10173 "initializer", decl);
10174 constexpr_p = false;
10181 error ("non-static data member %qE declared %<constexpr%>",
10183 constexpr_p = false;
10185 decl = build_decl (input_location,
10186 FIELD_DECL, unqualified_id, type);
10187 DECL_NONADDRESSABLE_P (decl) = bitfield;
10188 if (bitfield && !unqualified_id)
10189 TREE_NO_WARNING (decl) = 1;
10191 if (storage_class == sc_mutable)
10193 DECL_MUTABLE_P (decl) = 1;
10194 storage_class = sc_none;
10198 /* An attempt is being made to initialize a non-static
10199 member. This is new in C++11. */
10200 maybe_warn_cpp0x (CPP0X_NSDMI);
10203 bad_specifiers (decl, BSP_FIELD, virtualp,
10204 memfn_quals != TYPE_UNQUALIFIED,
10205 inlinep, friendp, raises != NULL_TREE);
10208 else if (TREE_CODE (type) == FUNCTION_TYPE
10209 || TREE_CODE (type) == METHOD_TYPE)
10211 tree original_name;
10214 if (!unqualified_id)
10215 return error_mark_node;
10217 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10218 original_name = dname;
10220 original_name = unqualified_id;
10222 if (storage_class == sc_auto)
10223 error ("storage class %<auto%> invalid for function %qs", name);
10224 else if (storage_class == sc_register)
10225 error ("storage class %<register%> invalid for function %qs", name);
10227 error ("storage class %<__thread%> invalid for function %qs", name);
10229 if (virt_specifiers)
10230 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10231 /* Function declaration not at top level.
10232 Storage classes other than `extern' are not allowed
10233 and `extern' makes no difference. */
10234 if (! toplevel_bindings_p ()
10235 && (storage_class == sc_static
10236 || declspecs->specs[(int)ds_inline])
10239 if (storage_class == sc_static)
10240 pedwarn (input_location, OPT_pedantic,
10241 "%<static%> specified invalid for function %qs "
10242 "declared out of global scope", name);
10244 pedwarn (input_location, OPT_pedantic,
10245 "%<inline%> specifier invalid for function %qs "
10246 "declared out of global scope", name);
10249 if (ctype == NULL_TREE)
10253 error ("virtual non-class function %qs", name);
10256 else if (sfk == sfk_constructor
10257 || sfk == sfk_destructor)
10259 error (funcdef_flag
10260 ? G_("%qs defined in a non-class scope")
10261 : G_("%qs declared in a non-class scope"), name);
10266 /* Record presence of `static'. */
10267 publicp = (ctype != NULL_TREE
10268 || storage_class == sc_extern
10269 || storage_class != sc_static);
10271 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10272 virtualp, flags, memfn_quals, raises,
10274 publicp, inlinep | (2 * constexpr_p), sfk,
10276 template_count, in_namespace, attrlist,
10277 declarator->id_loc);
10278 if (decl == NULL_TREE)
10279 return error_mark_node;
10283 int invalid_static = 0;
10285 /* Don't allow a static member function in a class, and forbid
10286 declaring main to be static. */
10287 if (TREE_CODE (type) == METHOD_TYPE)
10289 permerror (input_location, "cannot declare member function %qD to have "
10290 "static linkage", decl);
10291 invalid_static = 1;
10293 else if (current_function_decl)
10295 /* FIXME need arm citation */
10296 error ("cannot declare static function inside another function");
10297 invalid_static = 1;
10300 if (invalid_static)
10303 storage_class = sc_none;
10309 /* It's a variable. */
10311 /* An uninitialized decl with `extern' is a reference. */
10312 decl = grokvardecl (type, unqualified_id,
10315 (type_quals & TYPE_QUAL_CONST) != 0,
10316 ctype ? ctype : in_namespace);
10317 bad_specifiers (decl, BSP_VAR, virtualp,
10318 memfn_quals != TYPE_UNQUALIFIED,
10319 inlinep, friendp, raises != NULL_TREE);
10323 DECL_CONTEXT (decl) = ctype;
10326 permerror (input_location, "%<static%> may not be used when defining "
10327 "(as opposed to declaring) a static data member");
10329 storage_class = sc_none;
10331 if (storage_class == sc_register && TREE_STATIC (decl))
10333 error ("static member %qD declared %<register%>", decl);
10334 storage_class = sc_none;
10336 if (storage_class == sc_extern && pedantic)
10338 pedwarn (input_location, OPT_pedantic,
10339 "cannot explicitly declare member %q#D to have "
10340 "extern linkage", decl);
10341 storage_class = sc_none;
10344 else if (constexpr_p && DECL_EXTERNAL (decl))
10346 error ("declaration of constexpr variable %qD is not a definition",
10348 constexpr_p = false;
10352 if (storage_class == sc_extern && initialized && !funcdef_flag)
10354 if (toplevel_bindings_p ())
10356 /* It's common practice (and completely valid) to have a const
10357 be initialized and declared extern. */
10358 if (!(type_quals & TYPE_QUAL_CONST))
10359 warning (0, "%qs initialized and declared %<extern%>", name);
10363 error ("%qs has both %<extern%> and initializer", name);
10364 return error_mark_node;
10368 /* Record `register' declaration for warnings on &
10369 and in case doing stupid register allocation. */
10371 if (storage_class == sc_register)
10372 DECL_REGISTER (decl) = 1;
10373 else if (storage_class == sc_extern)
10374 DECL_THIS_EXTERN (decl) = 1;
10375 else if (storage_class == sc_static)
10376 DECL_THIS_STATIC (decl) = 1;
10378 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10379 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10380 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10382 /* Record constancy and volatility on the DECL itself . There's
10383 no need to do this when processing a template; we'll do this
10384 for the instantiated declaration based on the type of DECL. */
10385 if (!processing_template_decl)
10386 cp_apply_type_quals_to_decl (type_quals, decl);
10392 /* Subroutine of start_function. Ensure that each of the parameter
10393 types (as listed in PARMS) is complete, as is required for a
10394 function definition. */
10397 require_complete_types_for_parms (tree parms)
10399 for (; parms; parms = DECL_CHAIN (parms))
10401 if (dependent_type_p (TREE_TYPE (parms)))
10403 if (!VOID_TYPE_P (TREE_TYPE (parms))
10404 && complete_type_or_else (TREE_TYPE (parms), parms))
10406 relayout_decl (parms);
10407 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10410 /* grokparms or complete_type_or_else will have already issued
10412 TREE_TYPE (parms) = error_mark_node;
10416 /* Returns nonzero if T is a local variable. */
10419 local_variable_p (const_tree t)
10421 if ((TREE_CODE (t) == VAR_DECL
10422 /* A VAR_DECL with a context that is a _TYPE is a static data
10424 && !TYPE_P (CP_DECL_CONTEXT (t))
10425 /* Any other non-local variable must be at namespace scope. */
10426 && !DECL_NAMESPACE_SCOPE_P (t))
10427 || (TREE_CODE (t) == PARM_DECL))
10433 /* Like local_variable_p, but suitable for use as a tree-walking
10437 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10438 void *data ATTRIBUTE_UNUSED)
10440 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10442 else if (TYPE_P (*tp))
10443 *walk_subtrees = 0;
10449 /* Check that ARG, which is a default-argument expression for a
10450 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10451 something goes wrong. DECL may also be a _TYPE node, rather than a
10452 DECL, if there is no DECL available. */
10455 check_default_argument (tree decl, tree arg)
10460 if (TREE_CODE (arg) == DEFAULT_ARG)
10461 /* We get a DEFAULT_ARG when looking at an in-class declaration
10462 with a default argument. Ignore the argument for now; we'll
10463 deal with it after the class is complete. */
10472 decl_type = TREE_TYPE (decl);
10474 if (arg == error_mark_node
10475 || decl == error_mark_node
10476 || TREE_TYPE (arg) == error_mark_node
10477 || decl_type == error_mark_node)
10478 /* Something already went wrong. There's no need to check
10480 return error_mark_node;
10482 /* [dcl.fct.default]
10484 A default argument expression is implicitly converted to the
10486 if (!TREE_TYPE (arg)
10487 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10490 error ("default argument for %q#D has type %qT",
10491 decl, TREE_TYPE (arg));
10493 error ("default argument for parameter of type %qT has type %qT",
10494 decl_type, TREE_TYPE (arg));
10496 return error_mark_node;
10499 /* [dcl.fct.default]
10501 Local variables shall not be used in default argument
10504 The keyword `this' shall not be used in a default argument of a
10505 member function. */
10506 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10509 error ("default argument %qE uses local variable %qD", arg, var);
10510 return error_mark_node;
10517 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10520 type_is_deprecated (tree type)
10522 enum tree_code code;
10523 if (TREE_DEPRECATED (type))
10525 if (TYPE_NAME (type)
10526 && TREE_DEPRECATED (TYPE_NAME (type)))
10529 /* Do warn about using typedefs to a deprecated class. */
10530 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10531 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10533 code = TREE_CODE (type);
10535 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10536 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10537 || code == METHOD_TYPE || code == ARRAY_TYPE)
10538 return type_is_deprecated (TREE_TYPE (type));
10540 if (TYPE_PTRMEMFUNC_P (type))
10541 return type_is_deprecated
10542 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10547 /* Decode the list of parameter types for a function type.
10548 Given the list of things declared inside the parens,
10549 return a list of types.
10551 If this parameter does not end with an ellipsis, we append
10554 *PARMS is set to the chain of PARM_DECLs created. */
10557 grokparms (tree parmlist, tree *parms)
10559 tree result = NULL_TREE;
10560 tree decls = NULL_TREE;
10564 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10566 tree type = NULL_TREE;
10567 tree init = TREE_PURPOSE (parm);
10568 tree decl = TREE_VALUE (parm);
10569 const char *errmsg;
10571 if (parm == void_list_node)
10574 if (! decl || TREE_TYPE (decl) == error_mark_node)
10577 type = TREE_TYPE (decl);
10578 if (VOID_TYPE_P (type))
10580 if (same_type_p (type, void_type_node)
10581 && DECL_SELF_REFERENCE_P (type)
10582 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10583 /* this is a parmlist of `(void)', which is ok. */
10585 cxx_incomplete_type_error (decl, type);
10586 /* It's not a good idea to actually create parameters of
10587 type `void'; other parts of the compiler assume that a
10588 void type terminates the parameter list. */
10589 type = error_mark_node;
10590 TREE_TYPE (decl) = error_mark_node;
10593 if (type != error_mark_node
10594 && TYPE_FOR_JAVA (type)
10595 && MAYBE_CLASS_TYPE_P (type))
10597 error ("parameter %qD has Java class type", decl);
10598 type = error_mark_node;
10599 TREE_TYPE (decl) = error_mark_node;
10603 if (type != error_mark_node
10604 && (errmsg = targetm.invalid_parameter_type (type)))
10607 type = error_mark_node;
10608 TREE_TYPE (decl) = error_mark_node;
10611 if (type != error_mark_node)
10613 if (deprecated_state != DEPRECATED_SUPPRESS)
10615 tree deptype = type_is_deprecated (type);
10617 warn_deprecated_use (deptype, NULL_TREE);
10620 /* Top-level qualifiers on the parameters are
10621 ignored for function types. */
10622 type = cp_build_qualified_type (type, 0);
10623 if (TREE_CODE (type) == METHOD_TYPE)
10625 error ("parameter %qD invalidly declared method type", decl);
10626 type = build_pointer_type (type);
10627 TREE_TYPE (decl) = type;
10629 else if (abstract_virtuals_error (decl, type))
10630 any_error = 1; /* Seems like a good idea. */
10631 else if (POINTER_TYPE_P (type))
10633 /* [dcl.fct]/6, parameter types cannot contain pointers
10634 (references) to arrays of unknown bound. */
10635 tree t = TREE_TYPE (type);
10636 int ptr = TYPE_PTR_P (type);
10640 if (TYPE_PTR_P (t))
10642 else if (TREE_CODE (t) != ARRAY_TYPE)
10644 else if (!TYPE_DOMAIN (t))
10648 if (TREE_CODE (t) == ARRAY_TYPE)
10650 ? G_("parameter %qD includes pointer to array of "
10651 "unknown bound %qT")
10652 : G_("parameter %qD includes reference to array of "
10653 "unknown bound %qT"),
10659 else if (init && !processing_template_decl)
10660 init = check_default_argument (decl, init);
10663 DECL_CHAIN (decl) = decls;
10665 result = tree_cons (init, type, result);
10667 decls = nreverse (decls);
10668 result = nreverse (result);
10670 result = chainon (result, void_list_node);
10677 /* D is a constructor or overloaded `operator='.
10679 Let T be the class in which D is declared. Then, this function
10682 -1 if D's is an ill-formed constructor or copy assignment operator
10683 whose first parameter is of type `T'.
10684 0 if D is not a copy constructor or copy assignment
10686 1 if D is a copy constructor or copy assignment operator whose
10687 first parameter is a reference to non-const qualified T.
10688 2 if D is a copy constructor or copy assignment operator whose
10689 first parameter is a reference to const qualified T.
10691 This function can be used as a predicate. Positive values indicate
10692 a copy constructor and nonzero values indicate a copy assignment
10696 copy_fn_p (const_tree d)
10702 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10704 if (TREE_CODE (d) == TEMPLATE_DECL
10705 || (DECL_TEMPLATE_INFO (d)
10706 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10707 /* Instantiations of template member functions are never copy
10708 functions. Note that member functions of templated classes are
10709 represented as template functions internally, and we must
10710 accept those as copy functions. */
10713 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10717 arg_type = TREE_VALUE (args);
10718 if (arg_type == error_mark_node)
10721 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10723 /* Pass by value copy assignment operator. */
10726 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10727 && !TYPE_REF_IS_RVALUE (arg_type)
10728 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10730 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10736 args = TREE_CHAIN (args);
10738 if (args && args != void_list_node && !TREE_PURPOSE (args))
10739 /* There are more non-optional args. */
10745 /* D is a constructor or overloaded `operator='.
10747 Let T be the class in which D is declared. Then, this function
10748 returns true when D is a move constructor or move assignment
10749 operator, false otherwise. */
10752 move_fn_p (const_tree d)
10756 bool result = false;
10758 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10760 if (cxx_dialect == cxx98)
10761 /* There are no move constructors if we are in C++98 mode. */
10764 if (TREE_CODE (d) == TEMPLATE_DECL
10765 || (DECL_TEMPLATE_INFO (d)
10766 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10767 /* Instantiations of template member functions are never copy
10768 functions. Note that member functions of templated classes are
10769 represented as template functions internally, and we must
10770 accept those as copy functions. */
10773 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10777 arg_type = TREE_VALUE (args);
10778 if (arg_type == error_mark_node)
10781 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10782 && TYPE_REF_IS_RVALUE (arg_type)
10783 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10787 args = TREE_CHAIN (args);
10789 if (args && args != void_list_node && !TREE_PURPOSE (args))
10790 /* There are more non-optional args. */
10796 /* Remember any special properties of member function DECL. */
10799 grok_special_member_properties (tree decl)
10803 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10806 class_type = DECL_CONTEXT (decl);
10807 if (DECL_CONSTRUCTOR_P (decl))
10809 int ctor = copy_fn_p (decl);
10811 if (!DECL_ARTIFICIAL (decl))
10812 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10818 A non-template constructor for class X is a copy
10819 constructor if its first parameter is of type X&, const
10820 X&, volatile X& or const volatile X&, and either there
10821 are no other parameters or else all other parameters have
10822 default arguments. */
10823 TYPE_HAS_COPY_CTOR (class_type) = 1;
10824 if (user_provided_p (decl))
10825 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10827 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10829 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10831 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10832 if (user_provided_p (decl))
10833 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10835 else if (move_fn_p (decl) && user_provided_p (decl))
10836 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10837 else if (is_list_ctor (decl))
10838 TYPE_HAS_LIST_CTOR (class_type) = 1;
10840 if (DECL_DECLARED_CONSTEXPR_P (decl)
10841 && !copy_fn_p (decl) && !move_fn_p (decl))
10842 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10844 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10848 A non-template assignment operator for class X is a copy
10849 assignment operator if its parameter is of type X, X&, const
10850 X&, volatile X& or const volatile X&. */
10852 int assop = copy_fn_p (decl);
10856 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10857 if (user_provided_p (decl))
10858 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10860 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10862 else if (move_fn_p (decl) && user_provided_p (decl))
10863 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10865 /* Destructors are handled in check_methods. */
10868 /* Check a constructor DECL has the correct form. Complains
10869 if the class has a constructor of the form X(X). */
10872 grok_ctor_properties (const_tree ctype, const_tree decl)
10874 int ctor_parm = copy_fn_p (decl);
10880 A declaration of a constructor for a class X is ill-formed if
10881 its first parameter is of type (optionally cv-qualified) X
10882 and either there are no other parameters or else all other
10883 parameters have default arguments.
10885 We *don't* complain about member template instantiations that
10886 have this form, though; they can occur as we try to decide
10887 what constructor to use during overload resolution. Since
10888 overload resolution will never prefer such a constructor to
10889 the non-template copy constructor (which is either explicitly
10890 or implicitly defined), there's no need to worry about their
10891 existence. Theoretically, they should never even be
10892 instantiated, but that's hard to forestall. */
10893 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10901 /* An operator with this code is unary, but can also be binary. */
10904 ambi_op_p (enum tree_code code)
10906 return (code == INDIRECT_REF
10907 || code == ADDR_EXPR
10908 || code == UNARY_PLUS_EXPR
10909 || code == NEGATE_EXPR
10910 || code == PREINCREMENT_EXPR
10911 || code == PREDECREMENT_EXPR);
10914 /* An operator with this name can only be unary. */
10917 unary_op_p (enum tree_code code)
10919 return (code == TRUTH_NOT_EXPR
10920 || code == BIT_NOT_EXPR
10921 || code == COMPONENT_REF
10922 || code == TYPE_EXPR);
10925 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10926 errors are issued for invalid declarations. */
10929 grok_op_properties (tree decl, bool complain)
10931 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10933 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10934 tree name = DECL_NAME (decl);
10935 enum tree_code operator_code;
10940 /* Count the number of arguments and check for ellipsis. */
10941 for (argtype = argtypes, arity = 0;
10942 argtype && argtype != void_list_node;
10943 argtype = TREE_CHAIN (argtype))
10945 ellipsis_p = !argtype;
10947 class_type = DECL_CONTEXT (decl);
10948 if (class_type && !CLASS_TYPE_P (class_type))
10949 class_type = NULL_TREE;
10951 if (DECL_CONV_FN_P (decl))
10952 operator_code = TYPE_EXPR;
10956 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10957 if (ansi_opname (CODE) == name) \
10959 operator_code = (CODE); \
10962 else if (ansi_assopname (CODE) == name) \
10964 operator_code = (CODE); \
10965 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10969 #include "operators.def"
10970 #undef DEF_OPERATOR
10972 gcc_unreachable ();
10975 gcc_assert (operator_code != MAX_TREE_CODES);
10976 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10979 switch (operator_code)
10982 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10986 TYPE_GETS_DELETE (class_type) |= 1;
10990 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10993 case VEC_DELETE_EXPR:
10994 TYPE_GETS_DELETE (class_type) |= 2;
11001 /* [basic.std.dynamic.allocation]/1:
11003 A program is ill-formed if an allocation function is declared
11004 in a namespace scope other than global scope or declared static
11007 The same also holds true for deallocation functions. */
11008 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
11009 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11011 if (DECL_NAMESPACE_SCOPE_P (decl))
11013 if (CP_DECL_CONTEXT (decl) != global_namespace)
11015 error ("%qD may not be declared within a namespace", decl);
11018 else if (!TREE_PUBLIC (decl))
11020 error ("%qD may not be declared as static", decl);
11026 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
11028 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
11029 DECL_IS_OPERATOR_NEW (decl) = 1;
11031 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11032 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
11035 /* An operator function must either be a non-static member function
11036 or have at least one parameter of a class, a reference to a class,
11037 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11038 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11040 if (operator_code == TYPE_EXPR
11041 || operator_code == CALL_EXPR
11042 || operator_code == COMPONENT_REF
11043 || operator_code == ARRAY_REF
11044 || operator_code == NOP_EXPR)
11046 error ("%qD must be a nonstatic member function", decl);
11053 if (DECL_STATIC_FUNCTION_P (decl))
11055 error ("%qD must be either a non-static member "
11056 "function or a non-member function", decl);
11060 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11062 tree arg = non_reference (TREE_VALUE (p));
11063 if (arg == error_mark_node)
11066 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11067 because these checks are performed even on
11068 template functions. */
11069 if (MAYBE_CLASS_TYPE_P (arg)
11070 || TREE_CODE (arg) == ENUMERAL_TYPE)
11074 if (!p || p == void_list_node)
11077 error ("%qD must have an argument of class or "
11078 "enumerated type", decl);
11084 /* There are no restrictions on the arguments to an overloaded
11086 if (operator_code == CALL_EXPR)
11089 /* Warn about conversion operators that will never be used. */
11090 if (IDENTIFIER_TYPENAME_P (name)
11091 && ! DECL_TEMPLATE_INFO (decl)
11093 /* Warn only declaring the function; there is no need to
11094 warn again about out-of-class definitions. */
11095 && class_type == current_class_type)
11097 tree t = TREE_TYPE (name);
11098 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11101 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11103 if (TREE_CODE (t) == VOID_TYPE)
11104 warning (OPT_Wconversion,
11106 ? G_("conversion to a reference to void "
11107 "will never use a type conversion operator")
11108 : G_("conversion to void "
11109 "will never use a type conversion operator"));
11110 else if (class_type)
11112 if (t == class_type)
11113 warning (OPT_Wconversion,
11115 ? G_("conversion to a reference to the same type "
11116 "will never use a type conversion operator")
11117 : G_("conversion to the same type "
11118 "will never use a type conversion operator"));
11119 /* Don't force t to be complete here. */
11120 else if (MAYBE_CLASS_TYPE_P (t)
11121 && COMPLETE_TYPE_P (t)
11122 && DERIVED_FROM_P (t, class_type))
11123 warning (OPT_Wconversion,
11125 ? G_("conversion to a reference to a base class "
11126 "will never use a type conversion operator")
11127 : G_("conversion to a base class "
11128 "will never use a type conversion operator"));
11133 if (operator_code == COND_EXPR)
11136 error ("ISO C++ prohibits overloading operator ?:");
11139 else if (ellipsis_p)
11141 error ("%qD must not have variable number of arguments", decl);
11144 else if (ambi_op_p (operator_code))
11147 /* We pick the one-argument operator codes by default, so
11148 we don't have to change anything. */
11150 else if (arity == 2)
11152 /* If we thought this was a unary operator, we now know
11153 it to be a binary operator. */
11154 switch (operator_code)
11157 operator_code = MULT_EXPR;
11161 operator_code = BIT_AND_EXPR;
11164 case UNARY_PLUS_EXPR:
11165 operator_code = PLUS_EXPR;
11169 operator_code = MINUS_EXPR;
11172 case PREINCREMENT_EXPR:
11173 operator_code = POSTINCREMENT_EXPR;
11176 case PREDECREMENT_EXPR:
11177 operator_code = POSTDECREMENT_EXPR;
11181 gcc_unreachable ();
11184 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11186 if ((operator_code == POSTINCREMENT_EXPR
11187 || operator_code == POSTDECREMENT_EXPR)
11188 && ! processing_template_decl
11189 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11192 error ("postfix %qD must take %<int%> as its argument",
11195 error ("postfix %qD must take %<int%> as its second "
11203 error ("%qD must take either zero or one argument", decl);
11205 error ("%qD must take either one or two arguments", decl);
11209 /* More Effective C++ rule 6. */
11211 && (operator_code == POSTINCREMENT_EXPR
11212 || operator_code == POSTDECREMENT_EXPR
11213 || operator_code == PREINCREMENT_EXPR
11214 || operator_code == PREDECREMENT_EXPR))
11216 tree arg = TREE_VALUE (argtypes);
11217 tree ret = TREE_TYPE (TREE_TYPE (decl));
11218 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11219 arg = TREE_TYPE (arg);
11220 arg = TYPE_MAIN_VARIANT (arg);
11221 if (operator_code == PREINCREMENT_EXPR
11222 || operator_code == PREDECREMENT_EXPR)
11224 if (TREE_CODE (ret) != REFERENCE_TYPE
11225 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11227 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11228 build_reference_type (arg));
11232 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11233 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11237 else if (unary_op_p (operator_code))
11242 error ("%qD must take %<void%>", decl);
11244 error ("%qD must take exactly one argument", decl);
11248 else /* if (binary_op_p (operator_code)) */
11253 error ("%qD must take exactly one argument", decl);
11255 error ("%qD must take exactly two arguments", decl);
11259 /* More Effective C++ rule 7. */
11261 && (operator_code == TRUTH_ANDIF_EXPR
11262 || operator_code == TRUTH_ORIF_EXPR
11263 || operator_code == COMPOUND_EXPR))
11264 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11268 /* Effective C++ rule 23. */
11271 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11272 && (operator_code == PLUS_EXPR
11273 || operator_code == MINUS_EXPR
11274 || operator_code == TRUNC_DIV_EXPR
11275 || operator_code == MULT_EXPR
11276 || operator_code == TRUNC_MOD_EXPR)
11277 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11278 warning (OPT_Weffc__, "%qD should return by value", decl);
11280 /* [over.oper]/8 */
11281 for (; argtypes && argtypes != void_list_node;
11282 argtypes = TREE_CHAIN (argtypes))
11283 if (TREE_PURPOSE (argtypes))
11285 TREE_PURPOSE (argtypes) = NULL_TREE;
11286 if (operator_code == POSTINCREMENT_EXPR
11287 || operator_code == POSTDECREMENT_EXPR)
11289 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11294 error ("%qD cannot have default arguments", decl);
11302 /* Return a string giving the keyword associate with CODE. */
11304 static const char *
11305 tag_name (enum tag_types code)
11317 case typename_type:
11320 gcc_unreachable ();
11324 /* Name lookup in an elaborated-type-specifier (after the keyword
11325 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11326 elaborated-type-specifier is invalid, issue a diagnostic and return
11327 error_mark_node; otherwise, return the *_TYPE to which it referred.
11328 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11331 check_elaborated_type_specifier (enum tag_types tag_code,
11333 bool allow_template_p)
11339 struct S { struct S *p; };
11341 name lookup will find the TYPE_DECL for the implicit "S::S"
11342 typedef. Adjust for that here. */
11343 if (DECL_SELF_REFERENCE_P (decl))
11344 decl = TYPE_NAME (TREE_TYPE (decl));
11346 type = TREE_TYPE (decl);
11348 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11349 is false for this case as well. */
11350 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11352 error ("using template type parameter %qT after %qs",
11353 type, tag_name (tag_code));
11354 return error_mark_node;
11358 If the identifier resolves to a typedef-name or a template
11359 type-parameter, the elaborated-type-specifier is ill-formed.
11361 In other words, the only legitimate declaration to use in the
11362 elaborated type specifier is the implicit typedef created when
11363 the type is declared. */
11364 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11365 && !DECL_SELF_REFERENCE_P (decl)
11366 && tag_code != typename_type)
11368 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11369 error ("%q+D has a previous declaration here", decl);
11370 return error_mark_node;
11372 else if (TREE_CODE (type) != RECORD_TYPE
11373 && TREE_CODE (type) != UNION_TYPE
11374 && tag_code != enum_type
11375 && tag_code != typename_type)
11377 error ("%qT referred to as %qs", type, tag_name (tag_code));
11378 error ("%q+T has a previous declaration here", type);
11379 return error_mark_node;
11381 else if (TREE_CODE (type) != ENUMERAL_TYPE
11382 && tag_code == enum_type)
11384 error ("%qT referred to as enum", type);
11385 error ("%q+T has a previous declaration here", type);
11386 return error_mark_node;
11388 else if (!allow_template_p
11389 && TREE_CODE (type) == RECORD_TYPE
11390 && CLASSTYPE_IS_TEMPLATE (type))
11392 /* If a class template appears as elaborated type specifier
11393 without a template header such as:
11395 template <class T> class C {};
11396 void f(class C); // No template header here
11398 then the required template argument is missing. */
11399 error ("template argument required for %<%s %T%>",
11400 tag_name (tag_code),
11401 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11402 return error_mark_node;
11408 /* Lookup NAME in elaborate type specifier in scope according to
11409 SCOPE and issue diagnostics if necessary.
11410 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11411 found, and ERROR_MARK_NODE for type error. */
11414 lookup_and_check_tag (enum tag_types tag_code, tree name,
11415 tag_scope scope, bool template_header_p)
11419 if (scope == ts_global)
11421 /* First try ordinary name lookup, ignoring hidden class name
11422 injected via friend declaration. */
11423 decl = lookup_name_prefer_type (name, 2);
11424 /* If that fails, the name will be placed in the smallest
11425 non-class, non-function-prototype scope according to 3.3.1/5.
11426 We may already have a hidden name declared as friend in this
11427 scope. So lookup again but not ignoring hidden names.
11428 If we find one, that name will be made visible rather than
11429 creating a new tag. */
11431 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11434 decl = lookup_type_scope (name, scope);
11436 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11437 decl = DECL_TEMPLATE_RESULT (decl);
11439 if (decl && TREE_CODE (decl) == TYPE_DECL)
11441 /* Look for invalid nested type:
11445 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11447 error ("%qD has the same name as the class in which it is "
11450 return error_mark_node;
11453 /* Two cases we need to consider when deciding if a class
11454 template is allowed as an elaborated type specifier:
11455 1. It is a self reference to its own class.
11456 2. It comes with a template header.
11460 template <class T> class C {
11461 class C *c1; // DECL_SELF_REFERENCE_P is true
11464 template <class U> class C; // template_header_p is true
11465 template <class T> class C<T>::D {
11466 class C *c2; // DECL_SELF_REFERENCE_P is true
11469 t = check_elaborated_type_specifier (tag_code,
11472 | DECL_SELF_REFERENCE_P (decl));
11475 else if (decl && TREE_CODE (decl) == TREE_LIST)
11477 error ("reference to %qD is ambiguous", name);
11478 print_candidates (decl);
11479 return error_mark_node;
11485 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11486 Define the tag as a forward-reference if it is not defined.
11488 If a declaration is given, process it here, and report an error if
11489 multiple declarations are not identical.
11491 SCOPE is TS_CURRENT when this is also a definition. Only look in
11492 the current frame for the name (since C++ allows new names in any
11493 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11494 declaration. Only look beginning from the current scope outward up
11495 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11497 TEMPLATE_HEADER_P is true when this declaration is preceded by
11498 a set of template parameters. */
11501 xref_tag_1 (enum tag_types tag_code, tree name,
11502 tag_scope scope, bool template_header_p)
11504 enum tree_code code;
11506 tree context = NULL_TREE;
11508 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11514 code = RECORD_TYPE;
11520 code = ENUMERAL_TYPE;
11523 gcc_unreachable ();
11526 /* In case of anonymous name, xref_tag is only called to
11527 make type node and push name. Name lookup is not required. */
11528 if (ANON_AGGRNAME_P (name))
11531 t = lookup_and_check_tag (tag_code, name,
11532 scope, template_header_p);
11534 if (t == error_mark_node)
11535 return error_mark_node;
11537 if (scope != ts_current && t && current_class_type
11538 && template_class_depth (current_class_type)
11539 && template_header_p)
11541 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11542 definition of this tag. Since, in addition, we are currently
11543 processing a (member) template declaration of a template
11544 class, we must be very careful; consider:
11551 { template <class V>
11552 friend struct S1; };
11554 Here, the S2::S1 declaration should not be confused with the
11555 outer declaration. In particular, the inner version should
11556 have a template parameter of level 2, not level 1. This
11557 would be particularly important if the member declaration
11560 template <class V = U> friend struct S1;
11562 say, when we should tsubst into `U' when instantiating
11563 S2. On the other hand, when presented with:
11573 we must find the inner binding eventually. We
11574 accomplish this by making sure that the new type we
11575 create to represent this declaration has the right
11577 context = TYPE_CONTEXT (t);
11583 /* If no such tag is yet defined, create a forward-reference node
11584 and record it as the "definition".
11585 When a real declaration of this type is found,
11586 the forward-reference will be altered into a real type. */
11587 if (code == ENUMERAL_TYPE)
11589 error ("use of enum %q#D without previous declaration", name);
11590 return error_mark_node;
11594 t = make_class_type (code);
11595 TYPE_CONTEXT (t) = context;
11596 t = pushtag (name, t, scope);
11601 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11603 if (!redeclare_class_template (t, current_template_parms))
11604 return error_mark_node;
11606 else if (!processing_template_decl
11607 && CLASS_TYPE_P (t)
11608 && CLASSTYPE_IS_TEMPLATE (t))
11610 error ("redeclaration of %qT as a non-template", t);
11611 error ("previous declaration %q+D", t);
11612 return error_mark_node;
11615 /* Make injected friend class visible. */
11616 if (scope != ts_within_enclosing_non_class
11617 && hidden_name_p (TYPE_NAME (t)))
11619 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11620 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11622 if (TYPE_TEMPLATE_INFO (t))
11624 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11625 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11633 /* Wrapper for xref_tag_1. */
11636 xref_tag (enum tag_types tag_code, tree name,
11637 tag_scope scope, bool template_header_p)
11641 subtime = timevar_cond_start (TV_NAME_LOOKUP);
11642 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11643 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
11649 xref_tag_from_type (tree old, tree id, tag_scope scope)
11651 enum tag_types tag_kind;
11653 if (TREE_CODE (old) == RECORD_TYPE)
11654 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11656 tag_kind = union_type;
11658 if (id == NULL_TREE)
11659 id = TYPE_IDENTIFIER (old);
11661 return xref_tag (tag_kind, id, scope, false);
11664 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11665 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11666 access_* node, and the TREE_VALUE is the type of the base-class.
11667 Non-NULL TREE_TYPE indicates virtual inheritance.
11669 Returns true if the binfo hierarchy was successfully created,
11670 false if an error was detected. */
11673 xref_basetypes (tree ref, tree base_list)
11676 tree binfo, base_binfo;
11677 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11678 unsigned max_bases = 0; /* Maximum direct bases. */
11680 tree default_access;
11681 tree igo_prev; /* Track Inheritance Graph Order. */
11683 if (ref == error_mark_node)
11686 /* The base of a derived class is private by default, all others are
11688 default_access = (TREE_CODE (ref) == RECORD_TYPE
11689 && CLASSTYPE_DECLARED_CLASS (ref)
11690 ? access_private_node : access_public_node);
11692 /* First, make sure that any templates in base-classes are
11693 instantiated. This ensures that if we call ourselves recursively
11694 we do not get confused about which classes are marked and which
11696 basep = &base_list;
11699 tree basetype = TREE_VALUE (*basep);
11701 if (!(processing_template_decl && uses_template_parms (basetype))
11702 && !complete_type_or_else (basetype, NULL))
11703 /* An incomplete type. Remove it from the list. */
11704 *basep = TREE_CHAIN (*basep);
11708 if (TREE_TYPE (*basep))
11710 if (CLASS_TYPE_P (basetype))
11711 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11712 basep = &TREE_CHAIN (*basep);
11716 TYPE_MARKED_P (ref) = 1;
11718 /* The binfo slot should be empty, unless this is an (ill-formed)
11720 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11722 error ("redefinition of %q#T", ref);
11726 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11728 binfo = make_tree_binfo (max_bases);
11730 TYPE_BINFO (ref) = binfo;
11731 BINFO_OFFSET (binfo) = size_zero_node;
11732 BINFO_TYPE (binfo) = ref;
11734 /* Apply base-class info set up to the variants of this type. */
11735 fixup_type_variants (ref);
11739 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11740 /* An aggregate cannot have baseclasses. */
11741 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11743 if (TREE_CODE (ref) == UNION_TYPE)
11745 error ("derived union %qT invalid", ref);
11752 if (TYPE_FOR_JAVA (ref))
11754 error ("Java class %qT cannot have multiple bases", ref);
11761 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11763 if (TYPE_FOR_JAVA (ref))
11765 error ("Java class %qT cannot have virtual bases", ref);
11770 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11772 tree access = TREE_PURPOSE (base_list);
11773 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11774 tree basetype = TREE_VALUE (base_list);
11776 if (access == access_default_node)
11777 access = default_access;
11779 if (PACK_EXPANSION_P (basetype))
11780 basetype = PACK_EXPANSION_PATTERN (basetype);
11781 if (TREE_CODE (basetype) == TYPE_DECL)
11782 basetype = TREE_TYPE (basetype);
11783 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11785 error ("base type %qT fails to be a struct or class type",
11790 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11791 TYPE_FOR_JAVA (ref) = 1;
11793 base_binfo = NULL_TREE;
11794 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11796 base_binfo = TYPE_BINFO (basetype);
11797 /* The original basetype could have been a typedef'd type. */
11798 basetype = BINFO_TYPE (base_binfo);
11800 /* Inherit flags from the base. */
11801 TYPE_HAS_NEW_OPERATOR (ref)
11802 |= TYPE_HAS_NEW_OPERATOR (basetype);
11803 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11804 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11805 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11806 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11807 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11808 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11809 CLASSTYPE_REPEATED_BASE_P (ref)
11810 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11813 /* We must do this test after we've seen through a typedef
11815 if (TYPE_MARKED_P (basetype))
11817 if (basetype == ref)
11818 error ("recursive type %qT undefined", basetype);
11820 error ("duplicate base type %qT invalid", basetype);
11824 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11825 /* Regenerate the pack expansion for the bases. */
11826 basetype = make_pack_expansion (basetype);
11828 TYPE_MARKED_P (basetype) = 1;
11830 base_binfo = copy_binfo (base_binfo, basetype, ref,
11831 &igo_prev, via_virtual);
11832 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11833 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11835 BINFO_BASE_APPEND (binfo, base_binfo);
11836 BINFO_BASE_ACCESS_APPEND (binfo, access);
11839 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11840 /* If we have space in the vbase vector, we must have shared at
11841 least one of them, and are therefore diamond shaped. */
11842 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11844 /* Unmark all the types. */
11845 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11846 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11847 TYPE_MARKED_P (ref) = 0;
11849 /* Now see if we have a repeated base type. */
11850 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11852 for (base_binfo = binfo; base_binfo;
11853 base_binfo = TREE_CHAIN (base_binfo))
11855 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11857 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11860 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11862 for (base_binfo = binfo; base_binfo;
11863 base_binfo = TREE_CHAIN (base_binfo))
11864 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11865 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11874 /* Copies the enum-related properties from type SRC to type DST.
11875 Used with the underlying type of an enum and the enum itself. */
11877 copy_type_enum (tree dst, tree src)
11879 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11880 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11881 TYPE_SIZE (dst) = TYPE_SIZE (src);
11882 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11883 SET_TYPE_MODE (dst, TYPE_MODE (src));
11884 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11885 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11886 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11887 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11890 /* Begin compiling the definition of an enumeration type.
11893 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11895 UNDERLYING_TYPE is the type that will be used as the storage for
11896 the enumeration type. This should be NULL_TREE if no storage type
11899 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11901 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11903 Returns the type object, as yet incomplete.
11904 Also records info about it so that build_enumerator
11905 may be used to declare the individual values as they are read. */
11908 start_enum (tree name, tree enumtype, tree underlying_type,
11909 bool scoped_enum_p, bool *is_new)
11911 tree prevtype = NULL_TREE;
11912 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11916 /* [C++0x dcl.enum]p5:
11918 If not explicitly specified, the underlying type of a scoped
11919 enumeration type is int. */
11920 if (!underlying_type && scoped_enum_p)
11921 underlying_type = integer_type_node;
11923 if (underlying_type)
11924 underlying_type = cv_unqualified (underlying_type);
11926 /* If this is the real definition for a previous forward reference,
11927 fill in the contents in the same object that used to be the
11928 forward reference. */
11930 enumtype = lookup_and_check_tag (enum_type, name,
11931 /*tag_scope=*/ts_current,
11932 /*template_header_p=*/false);
11934 /* In case of a template_decl, the only check that should be deferred
11935 to instantiation time is the comparison of underlying types. */
11936 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11938 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11940 error_at (input_location, "scoped/unscoped mismatch "
11941 "in enum %q#T", enumtype);
11942 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11943 "previous definition here");
11944 enumtype = error_mark_node;
11946 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11948 error_at (input_location, "underlying type mismatch "
11949 "in enum %q#T", enumtype);
11950 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11951 "previous definition here");
11952 enumtype = error_mark_node;
11954 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11955 && !dependent_type_p (underlying_type)
11956 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11957 && !same_type_p (underlying_type,
11958 ENUM_UNDERLYING_TYPE (enumtype)))
11960 error_at (input_location, "different underlying type "
11961 "in enum %q#T", enumtype);
11962 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11963 "previous definition here");
11964 underlying_type = NULL_TREE;
11968 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11969 || processing_template_decl)
11971 /* In case of error, make a dummy enum to allow parsing to
11973 if (enumtype == error_mark_node)
11975 name = make_anon_name ();
11976 enumtype = NULL_TREE;
11979 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11980 of an opaque enum, or an opaque enum of an already defined
11981 enumeration (C++0x only).
11982 In any other case, it'll be NULL_TREE. */
11988 prevtype = enumtype;
11989 enumtype = cxx_make_type (ENUMERAL_TYPE);
11990 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11991 if (enumtype == error_mark_node)
11992 return error_mark_node;
11994 /* The enum is considered opaque until the opening '{' of the
11995 enumerator list. */
11996 SET_OPAQUE_ENUM_P (enumtype, true);
11997 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
12000 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
12002 if (underlying_type)
12004 if (CP_INTEGRAL_TYPE_P (underlying_type))
12006 copy_type_enum (enumtype, underlying_type);
12007 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12009 else if (dependent_type_p (underlying_type))
12010 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12012 error ("underlying type %<%T%> of %<%T%> must be an integral type",
12013 underlying_type, enumtype);
12016 /* If into a template class, the returned enum is always the first
12017 declaration (opaque or not) seen. This way all the references to
12018 this type will be to the same declaration. The following ones are used
12019 only to check for definition errors. */
12020 if (prevtype && processing_template_decl)
12026 /* After processing and defining all the values of an enumeration type,
12027 install their decls in the enumeration type.
12028 ENUMTYPE is the type object. */
12031 finish_enum_value_list (tree enumtype)
12034 tree underlying_type;
12037 tree minnode, maxnode;
12040 bool fixed_underlying_type_p
12041 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12043 /* We built up the VALUES in reverse order. */
12044 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12046 /* For an enum defined in a template, just set the type of the values;
12047 all further processing is postponed until the template is
12048 instantiated. We need to set the type so that tsubst of a CONST_DECL
12050 if (processing_template_decl)
12052 for (values = TYPE_VALUES (enumtype);
12054 values = TREE_CHAIN (values))
12055 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12059 /* Determine the minimum and maximum values of the enumerators. */
12060 if (TYPE_VALUES (enumtype))
12062 minnode = maxnode = NULL_TREE;
12064 for (values = TYPE_VALUES (enumtype);
12066 values = TREE_CHAIN (values))
12068 decl = TREE_VALUE (values);
12070 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12071 each enumerator has the type of its enumeration. Prior to the
12072 closing brace, the type of each enumerator is the type of its
12073 initializing value. */
12074 TREE_TYPE (decl) = enumtype;
12076 /* Update the minimum and maximum values, if appropriate. */
12077 value = DECL_INITIAL (decl);
12078 if (value == error_mark_node)
12079 value = integer_zero_node;
12080 /* Figure out what the minimum and maximum values of the
12081 enumerators are. */
12083 minnode = maxnode = value;
12084 else if (tree_int_cst_lt (maxnode, value))
12086 else if (tree_int_cst_lt (value, minnode))
12093 If the enumerator-list is empty, the underlying type is as if
12094 the enumeration had a single enumerator with value 0. */
12095 minnode = maxnode = integer_zero_node;
12097 if (!fixed_underlying_type_p)
12099 /* Compute the number of bits require to represent all values of the
12100 enumeration. We must do this before the type of MINNODE and
12101 MAXNODE are transformed, since tree_int_cst_min_precision relies
12102 on the TREE_TYPE of the value it is passed. */
12103 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12104 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12105 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12106 int precision = MAX (lowprec, highprec);
12108 bool use_short_enum;
12110 /* Determine the underlying type of the enumeration.
12114 The underlying type of an enumeration is an integral type that
12115 can represent all the enumerator values defined in the
12116 enumeration. It is implementation-defined which integral type is
12117 used as the underlying type for an enumeration except that the
12118 underlying type shall not be larger than int unless the value of
12119 an enumerator cannot fit in an int or unsigned int.
12121 We use "int" or an "unsigned int" as the underlying type, even if
12122 a smaller integral type would work, unless the user has
12123 explicitly requested that we use the smallest possible type. The
12124 user can request that for all enumerations with a command line
12125 flag, or for just one enumeration with an attribute. */
12127 use_short_enum = flag_short_enums
12128 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12130 for (itk = (use_short_enum ? itk_char : itk_int);
12134 underlying_type = integer_types[itk];
12135 if (underlying_type != NULL_TREE
12136 && TYPE_PRECISION (underlying_type) >= precision
12137 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12140 if (itk == itk_none)
12144 IF no integral type can represent all the enumerator values, the
12145 enumeration is ill-formed. */
12146 error ("no integral type can represent all of the enumerator values "
12147 "for %qT", enumtype);
12148 precision = TYPE_PRECISION (long_long_integer_type_node);
12149 underlying_type = integer_types[itk_unsigned_long_long];
12154 The value of sizeof() applied to an enumeration type, an object
12155 of an enumeration type, or an enumerator, is the value of sizeof()
12156 applied to the underlying type. */
12157 copy_type_enum (enumtype, underlying_type);
12159 /* Compute the minimum and maximum values for the type.
12163 For an enumeration where emin is the smallest enumerator and emax
12164 is the largest, the values of the enumeration are the values of the
12165 underlying type in the range bmin to bmax, where bmin and bmax are,
12166 respectively, the smallest and largest values of the smallest bit-
12167 field that can store emin and emax. */
12169 /* The middle-end currently assumes that types with TYPE_PRECISION
12170 narrower than their underlying type are suitably zero or sign
12171 extended to fill their mode. Similarly, it assumes that the front
12172 end assures that a value of a particular type must be within
12173 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12175 We used to set these fields based on bmin and bmax, but that led
12176 to invalid assumptions like optimizing away bounds checking. So
12177 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12178 TYPE_MAX_VALUE to the values for the mode above and only restrict
12179 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12180 ENUM_UNDERLYING_TYPE (enumtype)
12181 = build_distinct_type_copy (underlying_type);
12182 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12183 set_min_and_max_values_for_integral_type
12184 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12186 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12187 if (flag_strict_enums)
12188 set_min_and_max_values_for_integral_type (enumtype, precision,
12192 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12194 /* Convert each of the enumerators to the type of the underlying
12195 type of the enumeration. */
12196 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12198 location_t saved_location;
12200 decl = TREE_VALUE (values);
12201 saved_location = input_location;
12202 input_location = DECL_SOURCE_LOCATION (decl);
12203 if (fixed_underlying_type_p)
12204 /* If the enumeration type has a fixed underlying type, we
12205 already checked all of the enumerator values. */
12206 value = DECL_INITIAL (decl);
12208 value = perform_implicit_conversion (underlying_type,
12209 DECL_INITIAL (decl),
12210 tf_warning_or_error);
12211 input_location = saved_location;
12213 /* Do not clobber shared ints. */
12214 value = copy_node (value);
12216 TREE_TYPE (value) = enumtype;
12217 DECL_INITIAL (decl) = value;
12220 /* Fix up all variant types of this enum type. */
12221 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12222 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12224 /* Finish debugging output for this type. */
12225 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12228 /* Finishes the enum type. This is called only the first time an
12229 enumeration is seen, be it opaque or odinary.
12230 ENUMTYPE is the type object. */
12233 finish_enum (tree enumtype)
12235 if (processing_template_decl)
12237 if (at_function_scope_p ())
12238 add_stmt (build_min (TAG_DEFN, enumtype));
12242 /* Here there should not be any variants of this type. */
12243 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12244 && !TYPE_NEXT_VARIANT (enumtype));
12247 /* Build and install a CONST_DECL for an enumeration constant of the
12248 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12249 LOC is the location of NAME.
12250 Assignment of sequential values by default is handled here. */
12253 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12259 /* If the VALUE was erroneous, pretend it wasn't there; that will
12260 result in the enum being assigned the next value in sequence. */
12261 if (value == error_mark_node)
12264 /* Remove no-op casts from the value. */
12266 STRIP_TYPE_NOPS (value);
12268 if (! processing_template_decl)
12270 /* Validate and default VALUE. */
12271 if (value != NULL_TREE)
12273 value = cxx_constant_value (value);
12275 if (TREE_CODE (value) == INTEGER_CST
12276 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12278 value = perform_integral_promotions (value);
12282 error ("enumerator value for %qD is not an integer constant", name);
12287 /* Default based on previous value. */
12288 if (value == NULL_TREE)
12290 if (TYPE_VALUES (enumtype))
12293 unsigned HOST_WIDE_INT lo;
12297 /* C++03 7.2/4: If no initializer is specified for the first
12298 enumerator, the type is an unspecified integral
12299 type. Otherwise the type is the same as the type of the
12300 initializing value of the preceding enumerator unless the
12301 incremented value is not representable in that type, in
12302 which case the type is an unspecified integral type
12303 sufficient to contain the incremented value. */
12304 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12305 if (error_operand_p (prev_value))
12306 value = error_mark_node;
12309 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12310 TREE_INT_CST_HIGH (prev_value),
12315 tree type = TREE_TYPE (prev_value);
12316 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12317 di.low = lo; di.high = hi;
12318 if (!double_int_fits_to_tree_p (type, di))
12321 for (itk = itk_int; itk != itk_none; itk++)
12323 type = integer_types[itk];
12324 if (type != NULL_TREE
12325 && (pos || !TYPE_UNSIGNED (type))
12326 && double_int_fits_to_tree_p (type, di))
12329 if (type && cxx_dialect < cxx0x
12330 && itk > itk_unsigned_long)
12331 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12332 incremented enumerator value is too large for %<unsigned long%>" : "\
12333 incremented enumerator value is too large for %<long%>");
12335 if (type == NULL_TREE)
12338 value = double_int_to_tree (type, di);
12343 error ("overflow in enumeration values at %qD", name);
12344 value = error_mark_node;
12349 value = integer_zero_node;
12352 /* Remove no-op casts from the value. */
12353 STRIP_TYPE_NOPS (value);
12355 /* If the underlying type of the enum is fixed, check whether
12356 the enumerator values fits in the underlying type. If it
12357 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12358 if (ENUM_UNDERLYING_TYPE (enumtype)
12360 && TREE_CODE (value) == INTEGER_CST
12361 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12363 error ("enumerator value %E is too large for underlying type %<%T%>",
12364 value, ENUM_UNDERLYING_TYPE (enumtype));
12366 /* Silently convert the value so that we can continue. */
12367 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12372 /* C++ associates enums with global, function, or class declarations. */
12373 context = current_scope ();
12375 /* Build the actual enumeration constant. Note that the enumeration
12376 constants have the underlying type of the enum (if it is fixed)
12377 or the type of their initializer (if the underlying type of the
12378 enum is not fixed):
12382 If the underlying type is fixed, the type of each enumerator
12383 prior to the closing brace is the underlying type; if the
12384 initializing value of an enumerator cannot be represented by
12385 the underlying type, the program is ill-formed. If the
12386 underlying type is not fixed, the type of each enumerator is
12387 the type of its initializing value.
12389 If the underlying type is not fixed, it will be computed by
12390 finish_enum and we will reset the type of this enumerator. Of
12391 course, if we're processing a template, there may be no value. */
12392 type = value ? TREE_TYPE (value) : NULL_TREE;
12394 if (context && context == current_class_type)
12395 /* This enum declaration is local to the class. We need the full
12396 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12397 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12399 /* It's a global enum, or it's local to a function. (Note local to
12400 a function could mean local to a class method. */
12401 decl = build_decl (loc, CONST_DECL, name, type);
12403 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12404 TREE_CONSTANT (decl) = 1;
12405 TREE_READONLY (decl) = 1;
12406 DECL_INITIAL (decl) = value;
12408 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12409 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12410 on the TYPE_FIELDS list for `S'. (That's so that you can say
12411 things like `S::i' later.) */
12412 finish_member_declaration (decl);
12416 /* Add this enumeration constant to the list for this type. */
12417 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12420 /* Look for an enumerator with the given NAME within the enumeration
12421 type ENUMTYPE. This routine is used primarily for qualified name
12422 lookup into an enumerator in C++0x, e.g.,
12424 enum class Color { Red, Green, Blue };
12426 Color color = Color::Red;
12428 Returns the value corresponding to the enumerator, or
12429 NULL_TREE if no such enumerator was found. */
12431 lookup_enumerator (tree enumtype, tree name)
12434 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12436 e = purpose_member (name, TYPE_VALUES (enumtype));
12437 return e? TREE_VALUE (e) : NULL_TREE;
12441 /* We're defining DECL. Make sure that its type is OK. */
12444 check_function_type (tree decl, tree current_function_parms)
12446 tree fntype = TREE_TYPE (decl);
12447 tree return_type = complete_type (TREE_TYPE (fntype));
12449 /* In a function definition, arg types must be complete. */
12450 require_complete_types_for_parms (current_function_parms);
12452 if (dependent_type_p (return_type))
12454 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12455 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12457 tree args = TYPE_ARG_TYPES (fntype);
12459 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12460 error ("return type %q#T is incomplete", return_type);
12462 error ("return type has Java class type %q#T", return_type);
12464 /* Make it return void instead. */
12465 if (TREE_CODE (fntype) == METHOD_TYPE)
12466 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12468 TREE_CHAIN (args));
12470 fntype = build_function_type (void_type_node, args);
12472 = build_exception_variant (fntype,
12473 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12474 fntype = (cp_build_type_attribute_variant
12475 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12476 TREE_TYPE (decl) = fntype;
12479 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12482 /* Create the FUNCTION_DECL for a function definition.
12483 DECLSPECS and DECLARATOR are the parts of the declaration;
12484 they describe the function's name and the type it returns,
12485 but twisted together in a fashion that parallels the syntax of C.
12487 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12488 DECLARATOR is really the DECL for the function we are about to
12489 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12490 indicating that the function is an inline defined in-class.
12492 This function creates a binding context for the function body
12493 as well as setting up the FUNCTION_DECL in current_function_decl.
12495 For C++, we must first check whether that datum makes any sense.
12496 For example, "class A local_a(1,2);" means that variable local_a
12497 is an aggregate of type A, which should have a constructor
12498 applied to it with the argument list [1, 2].
12500 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12501 or may be a BLOCK if the function has been defined previously
12502 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12503 error_mark_node if the function has never been defined, or
12504 a BLOCK if the function has been defined somewhere. */
12507 start_preparsed_function (tree decl1, tree attrs, int flags)
12509 tree ctype = NULL_TREE;
12512 int doing_friend = 0;
12513 cp_binding_level *bl;
12514 tree current_function_parms;
12515 struct c_fileinfo *finfo
12516 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12517 bool honor_interface;
12519 /* Sanity check. */
12520 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12521 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12523 fntype = TREE_TYPE (decl1);
12524 if (TREE_CODE (fntype) == METHOD_TYPE)
12525 ctype = TYPE_METHOD_BASETYPE (fntype);
12527 /* ISO C++ 11.4/5. A friend function defined in a class is in
12528 the (lexical) scope of the class in which it is defined. */
12529 if (!ctype && DECL_FRIEND_P (decl1))
12531 ctype = DECL_FRIEND_CONTEXT (decl1);
12533 /* CTYPE could be null here if we're dealing with a template;
12534 for example, `inline friend float foo()' inside a template
12535 will have no CTYPE set. */
12536 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12542 if (DECL_DECLARED_INLINE_P (decl1)
12543 && lookup_attribute ("noinline", attrs))
12544 warning (0, "inline function %q+D given attribute noinline", decl1);
12546 /* Handle gnu_inline attribute. */
12547 if (GNU_INLINE_P (decl1))
12549 DECL_EXTERNAL (decl1) = 1;
12550 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12551 DECL_INTERFACE_KNOWN (decl1) = 1;
12552 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12555 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12556 /* This is a constructor, we must ensure that any default args
12557 introduced by this definition are propagated to the clones
12558 now. The clones are used directly in overload resolution. */
12559 adjust_clone_args (decl1);
12561 /* Sometimes we don't notice that a function is a static member, and
12562 build a METHOD_TYPE for it. Fix that up now. */
12563 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12564 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12566 /* Set up current_class_type, and enter the scope of the class, if
12569 push_nested_class (ctype);
12570 else if (DECL_STATIC_FUNCTION_P (decl1))
12571 push_nested_class (DECL_CONTEXT (decl1));
12573 /* Now that we have entered the scope of the class, we must restore
12574 the bindings for any template parameters surrounding DECL1, if it
12575 is an inline member template. (Order is important; consider the
12576 case where a template parameter has the same name as a field of
12577 the class.) It is not until after this point that
12578 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12579 if (flags & SF_INCLASS_INLINE)
12580 maybe_begin_member_template_processing (decl1);
12582 /* Effective C++ rule 15. */
12584 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12585 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12586 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12588 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12589 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12590 if (!DECL_INITIAL (decl1))
12591 DECL_INITIAL (decl1) = error_mark_node;
12593 /* This function exists in static storage.
12594 (This does not mean `static' in the C sense!) */
12595 TREE_STATIC (decl1) = 1;
12597 /* We must call push_template_decl after current_class_type is set
12598 up. (If we are processing inline definitions after exiting a
12599 class scope, current_class_type will be NULL_TREE until set above
12600 by push_nested_class.) */
12601 if (processing_template_decl)
12603 /* FIXME: Handle error_mark_node more gracefully. */
12604 tree newdecl1 = push_template_decl (decl1);
12605 if (newdecl1 != error_mark_node)
12609 /* We are now in the scope of the function being defined. */
12610 current_function_decl = decl1;
12612 /* Save the parm names or decls from this function's declarator
12613 where store_parm_decls will find them. */
12614 current_function_parms = DECL_ARGUMENTS (decl1);
12616 /* Make sure the parameter and return types are reasonable. When
12617 you declare a function, these types can be incomplete, but they
12618 must be complete when you define the function. */
12619 check_function_type (decl1, current_function_parms);
12621 /* Build the return declaration for the function. */
12622 restype = TREE_TYPE (fntype);
12623 if (DECL_RESULT (decl1) == NULL_TREE)
12627 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12628 DECL_ARTIFICIAL (resdecl) = 1;
12629 DECL_IGNORED_P (resdecl) = 1;
12630 DECL_RESULT (decl1) = resdecl;
12632 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12635 /* Let the user know we're compiling this function. */
12636 announce_function (decl1);
12638 /* Record the decl so that the function name is defined.
12639 If we already have a decl for this name, and it is a FUNCTION_DECL,
12640 use the old decl. */
12641 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12643 /* A specialization is not used to guide overload resolution. */
12644 if (!DECL_FUNCTION_MEMBER_P (decl1)
12645 && !(DECL_USE_TEMPLATE (decl1) &&
12646 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12648 tree olddecl = pushdecl (decl1);
12650 if (olddecl == error_mark_node)
12651 /* If something went wrong when registering the declaration,
12652 use DECL1; we have to have a FUNCTION_DECL to use when
12653 parsing the body of the function. */
12657 /* Otherwise, OLDDECL is either a previous declaration
12658 of the same function or DECL1 itself. */
12660 if (warn_missing_declarations
12661 && olddecl == decl1
12662 && !DECL_MAIN_P (decl1)
12663 && TREE_PUBLIC (decl1)
12664 && !DECL_DECLARED_INLINE_P (decl1))
12668 /* Check whether DECL1 is in an anonymous
12670 for (context = DECL_CONTEXT (decl1);
12672 context = DECL_CONTEXT (context))
12674 if (TREE_CODE (context) == NAMESPACE_DECL
12675 && DECL_NAME (context) == NULL_TREE)
12679 if (context == NULL)
12680 warning (OPT_Wmissing_declarations,
12681 "no previous declaration for %q+D", decl1);
12689 /* We need to set the DECL_CONTEXT. */
12690 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12691 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12693 fntype = TREE_TYPE (decl1);
12695 /* If #pragma weak applies, mark the decl appropriately now.
12696 The pragma only applies to global functions. Because
12697 determining whether or not the #pragma applies involves
12698 computing the mangled name for the declaration, we cannot
12699 apply the pragma until after we have merged this declaration
12700 with any previous declarations; if the original declaration
12701 has a linkage specification, that specification applies to
12702 the definition as well, and may affect the mangled name. */
12703 if (DECL_FILE_SCOPE_P (decl1))
12704 maybe_apply_pragma_weak (decl1);
12707 /* Reset this in case the call to pushdecl changed it. */
12708 current_function_decl = decl1;
12710 gcc_assert (DECL_INITIAL (decl1));
12712 /* This function may already have been parsed, in which case just
12713 return; our caller will skip over the body without parsing. */
12714 if (DECL_INITIAL (decl1) != error_mark_node)
12717 /* Initialize RTL machinery. We cannot do this until
12718 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12719 even when processing a template; this is how we get
12720 CFUN set up, and our per-function variables initialized.
12721 FIXME factor out the non-RTL stuff. */
12722 bl = current_binding_level;
12723 allocate_struct_function (decl1, processing_template_decl);
12725 /* Initialize the language data structures. Whenever we start
12726 a new function, we destroy temporaries in the usual way. */
12727 cfun->language = ggc_alloc_cleared_language_function ();
12728 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12729 current_binding_level = bl;
12731 /* Start the statement-tree, start the tree now. */
12732 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12734 /* If we are (erroneously) defining a function that we have already
12735 defined before, wipe out what we knew before. */
12736 if (!DECL_PENDING_INLINE_P (decl1))
12737 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12739 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12741 /* We know that this was set up by `grokclassfn'. We do not
12742 wait until `store_parm_decls', since evil parse errors may
12743 never get us to that point. Here we keep the consistency
12744 between `current_class_type' and `current_class_ptr'. */
12745 tree t = DECL_ARGUMENTS (decl1);
12747 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12748 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12750 cp_function_chain->x_current_class_ref
12751 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12752 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12753 cp_function_chain->x_current_class_ptr = t;
12755 /* Constructors and destructors need to know whether they're "in
12756 charge" of initializing virtual base classes. */
12757 t = DECL_CHAIN (t);
12758 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12760 current_in_charge_parm = t;
12761 t = DECL_CHAIN (t);
12763 if (DECL_HAS_VTT_PARM_P (decl1))
12765 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12766 current_vtt_parm = t;
12770 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12771 /* Implicitly-defined methods (like the
12772 destructor for a class in which no destructor
12773 is explicitly declared) must not be defined
12774 until their definition is needed. So, we
12775 ignore interface specifications for
12776 compiler-generated functions. */
12777 && !DECL_ARTIFICIAL (decl1));
12779 if (processing_template_decl)
12780 /* Don't mess with interface flags. */;
12781 else if (DECL_INTERFACE_KNOWN (decl1))
12783 tree ctx = decl_function_context (decl1);
12785 if (DECL_NOT_REALLY_EXTERN (decl1))
12786 DECL_EXTERNAL (decl1) = 0;
12788 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12789 && TREE_PUBLIC (ctx))
12790 /* This is a function in a local class in an extern inline
12792 comdat_linkage (decl1);
12794 /* If this function belongs to an interface, it is public.
12795 If it belongs to someone else's interface, it is also external.
12796 This only affects inlines and template instantiations. */
12797 else if (!finfo->interface_unknown && honor_interface)
12799 if (DECL_DECLARED_INLINE_P (decl1)
12800 || DECL_TEMPLATE_INSTANTIATION (decl1))
12802 DECL_EXTERNAL (decl1)
12803 = (finfo->interface_only
12804 || (DECL_DECLARED_INLINE_P (decl1)
12805 && ! flag_implement_inlines
12806 && !DECL_VINDEX (decl1)));
12808 /* For WIN32 we also want to put these in linkonce sections. */
12809 maybe_make_one_only (decl1);
12812 DECL_EXTERNAL (decl1) = 0;
12813 DECL_INTERFACE_KNOWN (decl1) = 1;
12814 /* If this function is in an interface implemented in this file,
12815 make sure that the back end knows to emit this function
12817 if (!DECL_EXTERNAL (decl1))
12818 mark_needed (decl1);
12820 else if (finfo->interface_unknown && finfo->interface_only
12821 && honor_interface)
12823 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12824 interface, we will have both finfo->interface_unknown and
12825 finfo->interface_only set. In that case, we don't want to
12826 use the normal heuristics because someone will supply a
12827 #pragma implementation elsewhere, and deducing it here would
12828 produce a conflict. */
12829 comdat_linkage (decl1);
12830 DECL_EXTERNAL (decl1) = 0;
12831 DECL_INTERFACE_KNOWN (decl1) = 1;
12832 DECL_DEFER_OUTPUT (decl1) = 1;
12836 /* This is a definition, not a reference.
12837 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12838 if (!GNU_INLINE_P (decl1))
12839 DECL_EXTERNAL (decl1) = 0;
12841 if ((DECL_DECLARED_INLINE_P (decl1)
12842 || DECL_TEMPLATE_INSTANTIATION (decl1))
12843 && ! DECL_INTERFACE_KNOWN (decl1))
12844 DECL_DEFER_OUTPUT (decl1) = 1;
12846 DECL_INTERFACE_KNOWN (decl1) = 1;
12849 /* Determine the ELF visibility attribute for the function. We must not
12850 do this before calling "pushdecl", as we must allow "duplicate_decls"
12851 to merge any attributes appropriately. We also need to wait until
12853 if (!DECL_CLONED_FUNCTION_P (decl1))
12854 determine_visibility (decl1);
12856 begin_scope (sk_function_parms, decl1);
12860 if (DECL_DESTRUCTOR_P (decl1)
12861 || (DECL_CONSTRUCTOR_P (decl1)
12862 && targetm.cxx.cdtor_returns_this ()))
12864 cdtor_label = build_decl (input_location,
12865 LABEL_DECL, NULL_TREE, NULL_TREE);
12866 DECL_CONTEXT (cdtor_label) = current_function_decl;
12869 start_fname_decls ();
12871 store_parm_decls (current_function_parms);
12875 /* Like start_preparsed_function, except that instead of a
12876 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12878 Returns 1 on success. If the DECLARATOR is not suitable for a function
12879 (it defines a datum instead), we return 0, which tells
12880 yyparse to report a parse error. */
12883 start_function (cp_decl_specifier_seq *declspecs,
12884 const cp_declarator *declarator,
12889 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12890 if (decl1 == error_mark_node)
12892 /* If the declarator is not suitable for a function definition,
12893 cause a syntax error. */
12894 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12896 error ("invalid function declaration");
12900 if (DECL_MAIN_P (decl1))
12901 /* main must return int. grokfndecl should have corrected it
12902 (and issued a diagnostic) if the user got it wrong. */
12903 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12904 integer_type_node));
12906 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12911 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12915 use_eh_spec_block (tree fn)
12917 return (flag_exceptions && flag_enforce_eh_specs
12918 && !processing_template_decl
12919 && !type_throw_all_p (TREE_TYPE (fn))
12920 /* We insert the EH_SPEC_BLOCK only in the original
12921 function; then, it is copied automatically to the
12923 && !DECL_CLONED_FUNCTION_P (fn)
12924 /* Implicitly-generated constructors and destructors have
12925 exception specifications. However, those specifications
12926 are the union of the possible exceptions specified by the
12927 constructors/destructors for bases and members, so no
12928 unallowed exception will ever reach this function. By
12929 not creating the EH_SPEC_BLOCK we save a little memory,
12930 and we avoid spurious warnings about unreachable
12932 && !DECL_DEFAULTED_FN (fn));
12935 /* Store the parameter declarations into the current function declaration.
12936 This is called after parsing the parameter declarations, before
12937 digesting the body of the function.
12939 Also install to binding contour return value identifier, if any. */
12942 store_parm_decls (tree current_function_parms)
12944 tree fndecl = current_function_decl;
12947 /* This is a chain of any other decls that came in among the parm
12948 declarations. If a parm is declared with enum {foo, bar} x;
12949 then CONST_DECLs for foo and bar are put here. */
12950 tree nonparms = NULL_TREE;
12952 if (current_function_parms)
12954 /* This case is when the function was defined with an ANSI prototype.
12955 The parms already have decls, so we need not do anything here
12956 except record them as in effect
12957 and complain if any redundant old-style parm decls were written. */
12959 tree specparms = current_function_parms;
12962 /* Must clear this because it might contain TYPE_DECLs declared
12964 current_binding_level->names = NULL;
12966 /* If we're doing semantic analysis, then we'll call pushdecl
12967 for each of these. We must do them in reverse order so that
12968 they end in the correct forward order. */
12969 specparms = nreverse (specparms);
12971 for (parm = specparms; parm; parm = next)
12973 next = DECL_CHAIN (parm);
12974 if (TREE_CODE (parm) == PARM_DECL)
12976 if (DECL_NAME (parm) == NULL_TREE
12977 || TREE_CODE (parm) != VOID_TYPE)
12980 error ("parameter %qD declared void", parm);
12984 /* If we find an enum constant or a type tag,
12985 put it aside for the moment. */
12986 TREE_CHAIN (parm) = NULL_TREE;
12987 nonparms = chainon (nonparms, parm);
12991 /* Get the decls in their original chain order and record in the
12992 function. This is all and only the PARM_DECLs that were
12993 pushed into scope by the loop above. */
12994 DECL_ARGUMENTS (fndecl) = getdecls ();
12997 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12999 /* Now store the final chain of decls for the arguments
13000 as the decl-chain of the current lexical scope.
13001 Put the enumerators in as well, at the front so that
13002 DECL_ARGUMENTS is not modified. */
13003 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
13005 if (use_eh_spec_block (current_function_decl))
13006 current_eh_spec_block = begin_eh_spec_block ();
13010 /* We have finished doing semantic analysis on DECL, but have not yet
13011 generated RTL for its body. Save away our current state, so that
13012 when we want to generate RTL later we know what to do. */
13015 save_function_data (tree decl)
13017 struct language_function *f;
13019 /* Save the language-specific per-function data so that we can
13020 get it back when we really expand this function. */
13021 gcc_assert (!DECL_PENDING_INLINE_P (decl));
13024 f = ggc_alloc_language_function ();
13025 memcpy (f, cp_function_chain, sizeof (struct language_function));
13026 DECL_SAVED_FUNCTION_DATA (decl) = f;
13028 /* Clear out the bits we don't need. */
13029 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
13030 f->bindings = NULL;
13031 f->x_local_names = NULL;
13032 f->base.local_typedefs = NULL;
13036 /* Set the return value of the constructor (if present). */
13039 finish_constructor_body (void)
13044 if (targetm.cxx.cdtor_returns_this ()
13045 && (! TYPE_FOR_JAVA (current_class_type)))
13047 /* Any return from a constructor will end up here. */
13048 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13050 val = DECL_ARGUMENTS (current_function_decl);
13051 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13052 DECL_RESULT (current_function_decl), val);
13053 /* Return the address of the object. */
13054 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13055 add_stmt (exprstmt);
13059 /* Do all the processing for the beginning of a destructor; set up the
13060 vtable pointers and cleanups for bases and members. */
13063 begin_destructor_body (void)
13065 tree compound_stmt;
13067 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13068 issued an error message. We still want to try to process the
13069 body of the function, but initialize_vtbl_ptrs will crash if
13070 TYPE_BINFO is NULL. */
13071 if (COMPLETE_TYPE_P (current_class_type))
13073 compound_stmt = begin_compound_stmt (0);
13074 /* Make all virtual function table pointers in non-virtual base
13075 classes point to CURRENT_CLASS_TYPE's virtual function
13077 initialize_vtbl_ptrs (current_class_ptr);
13078 finish_compound_stmt (compound_stmt);
13080 /* And insert cleanups for our bases and members so that they
13081 will be properly destroyed if we throw. */
13082 push_base_cleanups ();
13086 /* At the end of every destructor we generate code to delete the object if
13087 necessary. Do that now. */
13090 finish_destructor_body (void)
13094 /* Any return from a destructor will end up here; that way all base
13095 and member cleanups will be run when the function returns. */
13096 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13098 /* In a virtual destructor, we must call delete. */
13099 if (DECL_VIRTUAL_P (current_function_decl))
13102 tree virtual_size = cxx_sizeof (current_class_type);
13106 At the point of definition of a virtual destructor (including
13107 an implicit definition), non-placement operator delete shall
13108 be looked up in the scope of the destructor's class and if
13109 found shall be accessible and unambiguous. */
13110 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13112 /*global_p=*/false,
13113 /*placement=*/NULL_TREE,
13114 /*alloc_fn=*/NULL_TREE);
13116 if_stmt = begin_if_stmt ();
13117 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13118 current_in_charge_parm,
13121 finish_expr_stmt (exprstmt);
13122 finish_then_clause (if_stmt);
13123 finish_if_stmt (if_stmt);
13126 if (targetm.cxx.cdtor_returns_this ())
13130 val = DECL_ARGUMENTS (current_function_decl);
13131 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13132 DECL_RESULT (current_function_decl), val);
13133 /* Return the address of the object. */
13134 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13135 add_stmt (exprstmt);
13139 /* Do the necessary processing for the beginning of a function body, which
13140 in this case includes member-initializers, but not the catch clauses of
13141 a function-try-block. Currently, this means opening a binding level
13142 for the member-initializers (in a ctor), member cleanups (in a dtor),
13143 and capture proxies (in a lambda operator()). */
13146 begin_function_body (void)
13150 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13153 if (processing_template_decl)
13154 /* Do nothing now. */;
13156 /* Always keep the BLOCK node associated with the outermost pair of
13157 curly braces of a function. These are needed for correct
13158 operation of dwarfout.c. */
13159 keep_next_level (true);
13161 stmt = begin_compound_stmt (BCS_FN_BODY);
13163 if (processing_template_decl)
13164 /* Do nothing now. */;
13165 else if (DECL_DESTRUCTOR_P (current_function_decl))
13166 begin_destructor_body ();
13171 /* Do the processing for the end of a function body. Currently, this means
13172 closing out the cleanups for fully-constructed bases and members, and in
13173 the case of the destructor, deleting the object if desired. Again, this
13174 is only meaningful for [cd]tors, since they are the only functions where
13175 there is a significant distinction between the main body and any
13176 function catch clauses. Handling, say, main() return semantics here
13177 would be wrong, as flowing off the end of a function catch clause for
13178 main() would also need to return 0. */
13181 finish_function_body (tree compstmt)
13183 if (compstmt == NULL_TREE)
13186 /* Close the block. */
13187 finish_compound_stmt (compstmt);
13189 if (processing_template_decl)
13190 /* Do nothing now. */;
13191 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13192 finish_constructor_body ();
13193 else if (DECL_DESTRUCTOR_P (current_function_decl))
13194 finish_destructor_body ();
13197 /* Given a function, returns the BLOCK corresponding to the outermost level
13198 of curly braces, skipping the artificial block created for constructor
13202 outer_curly_brace_block (tree fndecl)
13204 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13205 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13206 /* Skip the artificial function body block. */
13207 block = BLOCK_SUBBLOCKS (block);
13211 /* If FNDECL is a class's key method, add the class to the list of
13212 keyed classes that should be emitted. */
13215 record_key_method_defined (tree fndecl)
13217 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13218 && DECL_VIRTUAL_P (fndecl)
13219 && !processing_template_decl)
13221 tree fnclass = DECL_CONTEXT (fndecl);
13222 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13223 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13227 /* Subroutine of finish_function.
13228 Save the body of constexpr functions for possible
13229 future compile time evaluation. */
13232 maybe_save_function_definition (tree fun)
13234 if (!processing_template_decl
13235 && DECL_DECLARED_CONSTEXPR_P (fun)
13236 && !DECL_CLONED_FUNCTION_P (fun))
13237 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13240 /* Finish up a function declaration and compile that function
13241 all the way to assembler language output. The free the storage
13242 for the function definition.
13244 FLAGS is a bitwise or of the following values:
13246 We just finished processing the body of an in-class inline
13247 function definition. (This processing will have taken place
13248 after the class definition is complete.) */
13251 finish_function (int flags)
13253 tree fndecl = current_function_decl;
13254 tree fntype, ctype = NULL_TREE;
13255 int inclass_inline = (flags & 2) != 0;
13257 /* When we get some parse errors, we can end up without a
13258 current_function_decl, so cope. */
13259 if (fndecl == NULL_TREE)
13260 return error_mark_node;
13262 if (c_dialect_objc ())
13263 objc_finish_function ();
13265 gcc_assert (!defer_mark_used_calls);
13266 defer_mark_used_calls = true;
13268 record_key_method_defined (fndecl);
13270 fntype = TREE_TYPE (fndecl);
13272 /* TREE_READONLY (fndecl) = 1;
13273 This caused &foo to be of type ptr-to-const-function
13274 which then got a warning when stored in a ptr-to-function variable. */
13276 gcc_assert (building_stmt_list_p ());
13277 /* The current function is being defined, so its DECL_INITIAL should
13278 be set, and unless there's a multiple definition, it should be
13279 error_mark_node. */
13280 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13282 /* For a cloned function, we've already got all the code we need;
13283 there's no need to add any extra bits. */
13284 if (!DECL_CLONED_FUNCTION_P (fndecl))
13286 if (DECL_MAIN_P (current_function_decl))
13288 /* Make it so that `main' always returns 0 by default (or
13291 finish_return_stmt (integer_one_node);
13293 finish_return_stmt (integer_zero_node);
13297 if (use_eh_spec_block (current_function_decl))
13298 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13299 (TREE_TYPE (current_function_decl)),
13300 current_eh_spec_block);
13303 /* If we're saving up tree structure, tie off the function now. */
13304 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13306 finish_fname_decls ();
13308 /* If this function can't throw any exceptions, remember that. */
13309 if (!processing_template_decl
13310 && !cp_function_chain->can_throw
13311 && !flag_non_call_exceptions
13312 && !decl_replaceable_p (fndecl))
13313 TREE_NOTHROW (fndecl) = 1;
13315 /* This must come after expand_function_end because cleanups might
13316 have declarations (from inline functions) that need to go into
13317 this function's blocks. */
13319 /* If the current binding level isn't the outermost binding level
13320 for this function, either there is a bug, or we have experienced
13321 syntax errors and the statement tree is malformed. */
13322 if (current_binding_level->kind != sk_function_parms)
13324 /* Make sure we have already experienced errors. */
13325 gcc_assert (errorcount);
13327 /* Throw away the broken statement tree and extra binding
13329 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13331 while (current_binding_level->kind != sk_function_parms)
13333 if (current_binding_level->kind == sk_class)
13334 pop_nested_class ();
13336 poplevel (0, 0, 0);
13339 poplevel (1, 0, 1);
13341 /* Statements should always be full-expressions at the outermost set
13342 of curly braces for a function. */
13343 gcc_assert (stmts_are_full_exprs_p ());
13345 /* Save constexpr function body before it gets munged by
13346 the NRV transformation. */
13347 maybe_save_function_definition (fndecl);
13349 /* Set up the named return value optimization, if we can. Candidate
13350 variables are selected in check_return_expr. */
13351 if (current_function_return_value)
13353 tree r = current_function_return_value;
13356 if (r != error_mark_node
13357 /* This is only worth doing for fns that return in memory--and
13358 simpler, since we don't have to worry about promoted modes. */
13359 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13360 /* Only allow this for variables declared in the outer scope of
13361 the function so we know that their lifetime always ends with a
13362 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13363 we were to do this optimization in tree-ssa. */
13364 && (outer = outer_curly_brace_block (fndecl))
13365 && chain_member (r, BLOCK_VARS (outer)))
13366 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13368 current_function_return_value = NULL_TREE;
13371 /* Remember that we were in class scope. */
13372 if (current_class_name)
13373 ctype = current_class_type;
13375 /* Must mark the RESULT_DECL as being in this function. */
13376 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13378 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13379 to the FUNCTION_DECL node itself. */
13380 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13382 /* Save away current state, if appropriate. */
13383 if (!processing_template_decl)
13384 save_function_data (fndecl);
13386 /* Complain if there's just no return statement. */
13387 if (warn_return_type
13388 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13389 && !dependent_type_p (TREE_TYPE (fntype))
13390 && !current_function_returns_value && !current_function_returns_null
13391 /* Don't complain if we abort or throw. */
13392 && !current_function_returns_abnormally
13393 /* Don't complain if we are declared noreturn. */
13394 && !TREE_THIS_VOLATILE (fndecl)
13395 && !DECL_NAME (DECL_RESULT (fndecl))
13396 && !TREE_NO_WARNING (fndecl)
13397 /* Structor return values (if any) are set by the compiler. */
13398 && !DECL_CONSTRUCTOR_P (fndecl)
13399 && !DECL_DESTRUCTOR_P (fndecl))
13401 warning (OPT_Wreturn_type,
13402 "no return statement in function returning non-void");
13403 TREE_NO_WARNING (fndecl) = 1;
13406 /* Store the end of the function, so that we get good line number
13407 info for the epilogue. */
13408 cfun->function_end_locus = input_location;
13410 /* Complain about parameters that are only set, but never otherwise used. */
13411 if (warn_unused_but_set_parameter
13412 && !processing_template_decl
13413 && errorcount == unused_but_set_errorcount
13414 && !DECL_CLONED_FUNCTION_P (fndecl))
13418 for (decl = DECL_ARGUMENTS (fndecl);
13420 decl = DECL_CHAIN (decl))
13421 if (TREE_USED (decl)
13422 && TREE_CODE (decl) == PARM_DECL
13423 && !DECL_READ_P (decl)
13424 && DECL_NAME (decl)
13425 && !DECL_ARTIFICIAL (decl)
13426 && !TREE_NO_WARNING (decl)
13427 && !DECL_IN_SYSTEM_HEADER (decl)
13428 && TREE_TYPE (decl) != error_mark_node
13429 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13430 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13431 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13432 warning (OPT_Wunused_but_set_parameter,
13433 "parameter %q+D set but not used", decl);
13434 unused_but_set_errorcount = errorcount;
13437 /* Complain about locally defined typedefs that are not used in this
13439 maybe_warn_unused_local_typedefs ();
13441 /* Genericize before inlining. */
13442 if (!processing_template_decl)
13444 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13445 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13446 cp_genericize (fndecl);
13447 /* Clear out the bits we don't need. */
13448 f->x_current_class_ptr = NULL;
13449 f->x_current_class_ref = NULL;
13450 f->x_eh_spec_block = NULL;
13451 f->x_in_charge_parm = NULL;
13452 f->x_vtt_parm = NULL;
13453 f->x_return_value = NULL;
13454 f->bindings = NULL;
13455 f->extern_decl_map = NULL;
13457 /* Clear out the bits we don't need. */
13458 local_names = NULL;
13460 /* We're leaving the context of this function, so zap cfun. It's still in
13461 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13463 current_function_decl = NULL;
13465 /* If this is an in-class inline definition, we may have to pop the
13466 bindings for the template parameters that we added in
13467 maybe_begin_member_template_processing when start_function was
13469 if (inclass_inline)
13470 maybe_end_member_template_processing ();
13472 /* Leave the scope of the class. */
13474 pop_nested_class ();
13479 current_function_decl = NULL_TREE;
13481 defer_mark_used_calls = false;
13482 if (deferred_mark_used_calls)
13487 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13489 VEC_free (tree, gc, deferred_mark_used_calls);
13495 /* Create the FUNCTION_DECL for a function definition.
13496 DECLSPECS and DECLARATOR are the parts of the declaration;
13497 they describe the return type and the name of the function,
13498 but twisted together in a fashion that parallels the syntax of C.
13500 This function creates a binding context for the function body
13501 as well as setting up the FUNCTION_DECL in current_function_decl.
13503 Returns a FUNCTION_DECL on success.
13505 If the DECLARATOR is not suitable for a function (it defines a datum
13506 instead), we return 0, which tells yyparse to report a parse error.
13508 May return void_type_node indicating that this method is actually
13509 a friend. See grokfield for more details.
13511 Came here with a `.pushlevel' .
13513 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13514 CHANGES TO CODE IN `grokfield'. */
13517 grokmethod (cp_decl_specifier_seq *declspecs,
13518 const cp_declarator *declarator, tree attrlist)
13520 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13523 if (fndecl == error_mark_node)
13524 return error_mark_node;
13526 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13528 error ("invalid member function declaration");
13529 return error_mark_node;
13533 cplus_decl_attributes (&fndecl, attrlist, 0);
13535 /* Pass friends other than inline friend functions back. */
13536 if (fndecl == void_type_node)
13539 if (DECL_IN_AGGR_P (fndecl))
13541 if (DECL_CLASS_SCOPE_P (fndecl))
13542 error ("%qD is already defined in class %qT", fndecl,
13543 DECL_CONTEXT (fndecl));
13544 return error_mark_node;
13547 check_template_shadow (fndecl);
13549 DECL_DECLARED_INLINE_P (fndecl) = 1;
13550 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13552 /* We process method specializations in finish_struct_1. */
13553 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13555 fndecl = push_template_decl (fndecl);
13556 if (fndecl == error_mark_node)
13560 if (! DECL_FRIEND_P (fndecl))
13562 if (DECL_CHAIN (fndecl))
13564 fndecl = copy_node (fndecl);
13565 TREE_CHAIN (fndecl) = NULL_TREE;
13569 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13571 DECL_IN_AGGR_P (fndecl) = 1;
13576 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13577 we can lay it out later, when and if its type becomes complete. */
13580 maybe_register_incomplete_var (tree var)
13582 gcc_assert (TREE_CODE (var) == VAR_DECL);
13584 /* Keep track of variables with incomplete types. */
13585 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13586 && DECL_EXTERNAL (var))
13588 tree inner_type = TREE_TYPE (var);
13590 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13591 inner_type = TREE_TYPE (inner_type);
13592 inner_type = TYPE_MAIN_VARIANT (inner_type);
13594 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13595 /* RTTI TD entries are created while defining the type_info. */
13596 || (TYPE_LANG_SPECIFIC (inner_type)
13597 && TYPE_BEING_DEFINED (inner_type)))
13600 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13602 iv->incomplete_type = inner_type;
13607 /* Called when a class type (given by TYPE) is defined. If there are
13608 any existing VAR_DECLs whose type has been completed by this
13609 declaration, update them now. */
13612 complete_vars (tree type)
13615 incomplete_var *iv;
13617 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13619 if (same_type_p (type, iv->incomplete_type))
13621 tree var = iv->decl;
13622 tree type = TREE_TYPE (var);
13623 /* Complete the type of the variable. The VAR_DECL itself
13624 will be laid out in expand_expr. */
13625 complete_type (type);
13626 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13627 /* Remove this entry from the list. */
13628 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13634 /* Check for pending declarations which may have abstract type. */
13635 complete_type_check_abstract (type);
13638 /* If DECL is of a type which needs a cleanup, build and return an
13639 expression to perform that cleanup here. Return NULL_TREE if no
13640 cleanup need be done. */
13643 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13649 /* Assume no cleanup is required. */
13650 cleanup = NULL_TREE;
13652 if (error_operand_p (decl))
13655 /* Handle "__attribute__((cleanup))". We run the cleanup function
13656 before the destructor since the destructor is what actually
13657 terminates the lifetime of the object. */
13658 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13665 /* Get the name specified by the user for the cleanup function. */
13666 id = TREE_VALUE (TREE_VALUE (attr));
13667 /* Look up the name to find the cleanup function to call. It is
13668 important to use lookup_name here because that is what is
13669 used in c-common.c:handle_cleanup_attribute when performing
13670 initial checks on the attribute. Note that those checks
13671 include ensuring that the function found is not an overloaded
13672 function, or an object with an overloaded call operator,
13673 etc.; we can rely on the fact that the function found is an
13674 ordinary FUNCTION_DECL. */
13675 fn = lookup_name (id);
13676 arg = build_address (decl);
13678 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13679 if (cleanup == error_mark_node)
13680 return error_mark_node;
13682 /* Handle ordinary C++ destructors. */
13683 type = TREE_TYPE (decl);
13684 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13686 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13687 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13688 && CLASSTYPE_VBASECLASSES (type));
13692 if (TREE_CODE (type) == ARRAY_TYPE)
13695 addr = build_address (decl);
13697 /* Optimize for space over speed here. */
13698 if (!has_vbases || flag_expensive_optimizations)
13699 flags |= LOOKUP_NONVIRTUAL;
13701 call = build_delete (TREE_TYPE (addr), addr,
13702 sfk_complete_destructor, flags, 0, complain);
13703 if (call == error_mark_node)
13704 cleanup = error_mark_node;
13706 cleanup = cp_build_compound_expr (cleanup, call, complain);
13714 /* When a stmt has been parsed, this function is called. */
13721 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13722 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13723 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13726 static_fn_type (tree memfntype)
13731 if (TYPE_PTRMEMFUNC_P (memfntype))
13732 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13733 if (POINTER_TYPE_P (memfntype)
13734 || TREE_CODE (memfntype) == FUNCTION_DECL)
13735 memfntype = TREE_TYPE (memfntype);
13736 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13738 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13739 args = TYPE_ARG_TYPES (memfntype);
13740 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13741 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13742 fntype = (cp_build_type_attribute_variant
13743 (fntype, TYPE_ATTRIBUTES (memfntype)));
13744 fntype = (build_exception_variant
13745 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13749 /* DECL was originally constructed as a non-static member function,
13750 but turned out to be static. Update it accordingly. */
13753 revert_static_member_fn (tree decl)
13755 tree stype = static_fn_type (decl);
13756 cp_cv_quals quals = type_memfn_quals (stype);
13758 if (quals != TYPE_UNQUALIFIED)
13759 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13761 TREE_TYPE (decl) = stype;
13763 if (DECL_ARGUMENTS (decl))
13764 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13765 DECL_STATIC_FUNCTION_P (decl) = 1;
13768 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13769 one of the language-independent trees. */
13771 enum cp_tree_node_structure_enum
13772 cp_tree_node_structure (union lang_tree_node * t)
13774 switch (TREE_CODE (&t->generic))
13776 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13777 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13778 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13779 case OVERLOAD: return TS_CP_OVERLOAD;
13780 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13781 case PTRMEM_CST: return TS_CP_PTRMEM;
13782 case BASELINK: return TS_CP_BASELINK;
13783 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13784 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13785 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13786 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13787 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13788 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
13789 default: return TS_CP_GENERIC;
13793 /* Build the void_list_node (void_type_node having been created). */
13795 build_void_list_node (void)
13797 tree t = build_tree_list (NULL_TREE, void_type_node);
13802 cp_missing_noreturn_ok_p (tree decl)
13804 /* A missing noreturn is ok for the `main' function. */
13805 return DECL_MAIN_P (decl);
13808 /* Return the COMDAT group into which DECL should be placed. */
13811 cxx_comdat_group (tree decl)
13815 /* Virtual tables, construction virtual tables, and virtual table
13816 tables all go in a single COMDAT group, named after the primary
13818 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13819 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13820 /* For all other DECLs, the COMDAT group is the mangled name of the
13821 declaration itself. */
13824 while (DECL_THUNK_P (decl))
13826 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13827 into the same section as the target function. In that case
13828 we must return target's name. */
13829 tree target = THUNK_TARGET (decl);
13830 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13831 && DECL_SECTION_NAME (target) != NULL
13832 && DECL_ONE_ONLY (target))
13837 name = DECL_ASSEMBLER_NAME (decl);
13843 #include "gt-cp-decl.h"